Kyokushin career (1977–1991)

After winning a number of beginners' karate competitions, Andy Hug was selected to represent the Wohlen Karate School during the National Team Championships in November 1977. His breakthrough performance came at the Swiss national Oyama Cup in 1979 at the age of fifteen when he defeated several opponents much older than himself to take the tournament crown. In 1981, Hug had an upsurge in competition as he was part of the Swiss team that defeated the Dutch in the finals to win the 4 Countries Team Tournament and recorded his first international success by taking a bronze medal at the 5th Dutch Kyokushin Championships in the 80 kg/176 lb middleweight division in Weert, Netherlands as he lost out to Koen Scharrenberg in the semi-finals. He also won the Swiss Oyama Cup for a second time that year, beating Heinz Muntweiler in the final, before further establishing himself as the country's top Kyokushin fighter by winning the 1982 Swiss Championships at middleweight. After reaching the round of sixteen in both the 2nd European Championships and the 6th Dutch Open, being eliminated by Jean-Pierre Louisset and Kenneth Felter respectively, Hug closed out the year by being crowned champion at the 1st Ibusz Oyama Cup in Budapest, Hungary where he defeated Mark Niedziokka in the final.

Hug again made it to the last sixteen at the 7th Dutch Open in 1983 and in 1984, he moved up to the heavyweight class with instant success, winning the Swiss nationals. In January 1984, he competed in the 3rd edition of the Kyokushin World Open, knockdown karate's most prestigious competition held once every four years. Andy was able to battle his way through and reached the final sixteen but lost to Shokei Matsui on points. 1985 was another successful year for Hug as he won the Ibusz Oyama Cup for the second time and the Swiss nationals for the third time before taking his most notable prize to date when he outpointed Klaus Rex in the final to win the 3rd edition of the European Championships in Barcelona, Spain in December of that year.

At the 11th British Open in London, England in 1986, he was eliminated at the semi-final round by Michael Thompson. They would then rematch at the same stage of the 4th European Kyokushin Championships in Katowice, Poland in May 1987 with the Englishman again coming out on top and forcing Hug to relinquish his title as European champion. Andy Hug returned to the World Open in November 1987 and made history by becoming the first gaijin to reach the final of the tournament, booking his place with a judges' decision win over Akira Masuda in the semis. There, he again faced Shokei Matsui and lost to his Japanese foe by decision once again.

With his status as an elite Kyokushin fighter secured, Hug began to compete more sparingly over the next few years. He won the 1st Sursee Cup in 1988, defeating Kenji Midori in the final, and became a two-time European champion in 1989 when he beat Michael Thompson to win the 5th European Championships in Budapest.

After an uneventful year in 1990, Andy Hug returned to the spotlight in '91 when he reached the final of the 6th European Championships in Budapest only to lose to Michael Thompson once more. The 5th World Championships also took place that year at the Budokan in Tokyo, Japan. In his third fight, Andy came up against Francisco Filho. At the end of the round, as the bell rang, Filho landed a mawashi geri on the side of Hug's head which left him unconscious on the floor. Despite protest from the Swiss camp, it was later confirmed that Filho's kick had indeed struck after the bell rang, but he had started his move before the time was up and Filho was declared the winner.

Switch to Seidokaikan and entry into K-1 (1992–1993)

Having been fighting in Japan with success for a number of years, Hug became extremely popular in the country. The fans were impressed by his technical diversity, spectacular aesthetics, tactics and strength. In 1992, he made the switch from Kyokushinkaikan to Seidokaikan, completing the step from being an amateur to becoming a professional fighter and star in Japan. He debuted as a Seidokaikan karate fighter on July 30, 1992, defeating Toshiyuki Yanagisawa on points at the Seidokaikan Kakutogi Olympics II. He then competed in and won the 1992 Seidokaikan Karate World Cup on October 2, 1992, overcoming Taiei Kin in the final. On April 30, 1993, Hug fought in K-1 for the first time, albeit under Seidokaikan rules, in a rematch with Nobuaki Kakuda at the K-1 Grand Prix '93. The pair previously met at the second round of the 1992 Seidokaikan Karate World Cup with Hug winning by ippon and the Swiss repeated his performance by stopping Kakuda with a knee strike from the Thai clinch in round two.^[13]

Facing another of his previous opponents from the 1992 Seidokaikan Karate World Cup, he beat Minoru Fujita by decision at K-1 Sanctuary III on June 25, 1993. Undefeated as a Seidokaikan fighter, Hug entered the K-1 Illusion 1993 Karate World Cup on October 2, 1993, defeating Yoshinori Arata, Changpuek Kiatsongrit and Toshiyuki Atokawa on his way to the final where he met Masaaki Satake. After four overtime rounds, the bout went to sudden death where Hug lost in a tameshiwari contest.

Following the tournament, Hug began his transition from full contact karate to kickboxing and, already a part of K-1's roster, made his debut against Ryuji Murakami at K-1 Andy's Glove on November 15, 1993. He won by first round knockout, dropping Murakami with a body kick early before finishing him off with a right hook soon after. In a non-tournament attraction at the K-2 Grand Prix '93 on December 19, 1993, Hug faced Eric Albert and hurt the Frenchman seconds after the opening bell when he rushed out and landed his trademark axe kick on his face. After a prolonged beating and a spinning back kick knockdown, Hug was able to put Albert away with a series of punches late in round two. In just his third outing in the kickboxing ring, he took a considerable step up in class as he faced off with the reigning K-1 World Grand Prix champion Branko Cikatić at K-1 Challenge on March 3, 1994. Struggling early due to his lack of boxing prowess, Hug received a standing eight count from referee Genshu Igari in round one after being rocked by an uppercut from Cikatić. Hug, however, came into his own as the fight went on, utilizing his kicking game to better effect and boxing from the inside, even forcing a count of his own on the Croatian before winning a unanimous decision after five rounds.

Struggles at the World Grand Prix (1994–1995)

With the win over Branko Cikatić, Andy Hug proved himself to be competent kickboxer and was entered into his first K-1 World Grand Prix, fighting at the K-1 Grand Prix '94 on April 30, 1994, where he faced Patrick Smith in the quarter-finals. Hug struggled with Smith's aggression and punch-heavy style, suffering three knockdowns in nineteen seconds and losing by technical knockout. Some pundits, most notoriously Dave Meltzer, have expressed their belief that Hug's loss was a fight fixed in order to increase Smith's popularity.^[14] Hug had problems with his gumshield as his molars didn't clamp down on it properly and he was instead pinching it with his incisors. In time, however, the K-1 doctors discovered the dental problems and fitted him with a mouthpiece that would provide standard protection.^[15] The rematch between Andy Hug and Pat Smith took place at K-1 Revenge on September 18, 1994, and the American again opened with an axe kick just as he done in the first fight. This time, however, Hug countered with the "Hug Tornado", sweeping Smith to the canvas. As the fight went on, Hug weathered Smith's aggressive start and completed his revenge when he knocked him unconscious with a knee at the 0:56 mark of round one. In a kickboxing match at the 1994 Seidokaikan Karate World Cup on October 2, 1994, he scored a third round liver kick knockout of Duke Roufus before closing out the year by winning the UKF World Super Heavyweight Championship with a spectacular fourth-round KO win against Rob van Esdonk at K-1 Legend on December 10, 1994.

On March 3, 1995, Hug entered the 1995 Grand Prix at the round of sixteen qualifier where his rivalry with Mike Bernardo began. Both fighters traded heavy shots with Bernardo seemingly getting the better until Hug dropped him with a high kick towards the end of the first round. The South African boxer continued to pile on the pressure, however, and in the third, knocked Hug down with a left hook shortly followed by a standing eight count. Finally, he forced Hug into a corner and delivered a relentless beating on the Swiss karateka until referee Nobuaki Kakuda finally stopped the bout after a prolonged barrage of unanswered punches. Hug had a quick turnaround, as he was back in the ring on May 4, 1995, scoring a forty-five second knockout over Peter Kramer in a K-1 World Grand Prix 1995 non-tournament affair. On June 10, 1995, Hug made the first defence of his UKF title against Dennis Lane at K-1 Fight Night in Zurich, the first K-1 event held in Switzerland. In a rather one-sided fight, Andy Hug knocked Lane down twice in the first two rounds before the American quit on his stool.

Hug would then lose in his next two outings, firstly to Ernesto Hoost by majority decision at the K-3 Grand Prix '95 on July 16, 1995, and then Mike Bernardo by KO in a rematch at K-1 Revenge II on September 3, 1995. The fight was even going into the latter stages of round two when Bernardo landed a right hook which sent Hug to the canvas. He was able to make it back to his feet but was clearly on wobbly legs and the referee in charge, Genshu Igari, stopped him from taking any more damage than was necessary.

Sitting on a less-than-spectacular 8–4 record and having lost in his previous two matches, Hug was struggling with depression and felt at odds with the sport, questioning whether or not he had it in him to continue at the elite level.^[16] He persisted, however, after a rejuvenating unanimous decision win over Jérôme Le Banner at K-1 Hercules on December 9, 1995, and went into the 1996 campaign in good form.

Winning the K-1 World Grand Prix Championship (1996)

Kicking off the most successful year of his career, Andy Hug demolished an overmatched Bart Vale at the K-1 Grand Prix '96 Opening Battle on March 3, 1996, to qualify for the K-1 Grand Prix '96 which was held two months later on May 6. After making short work of Duane van der Merwe with a KO inside forty seconds at the tournament's quarter-final stage, awaiting Hug was Ernesto Hoost in the semis and the pair had an epic battle considered to be one of the greatest matches in K-1's history. A back-and-forth fight in which Hoost delivered punishing low kicks throughout and both fighters traded heavily in the clinch, the judges ruled it a split draw after the regulation three rounds and so it went to an extension round to decide the winner only for it again to be scored a majority draw. Finally, after five grueling rounds, Hug was ruled the victor by split decision. In the final, he went up against Mike Bernardo, the South African power puncher who had knocked him out twice previously. It was not to be three-in-a-row for Bernardo, however, as a combination of fatigue and Hug's low kicks began to wear him down in the second round. Bernardo went down from a roundhouse kick to his left thigh but got back to his feet only for Hug to deliver one of the most spectacular stoppages of the 1990s, landing the "Hug Tornado" on Bernardo's already-injured left leg to put him away and clinch the coveted K-1 World Grand Prix Championship.^[17]

Hug returned to Zurich to face Muay Thai stylist Sadau Kiatsongrit in his second and last defence of the UKF super heavyweight title at K-1 Fight Night II on June 2, 1996, dispatching the Thai with a right hook at the end of round two after flooring him moments earlier. At September 1's K-1 Revenge '96, Hug fought the first of his own six Muay Thai matches, challenging Stan Longinidis for his WMTC World Super Heavyweight (+95 kg/209 lb) Championship. They exchanged heavy strikes in a close first round but Hug then went out and severely outgunned Longinidis in the second, knocking his Australian opponent down with a high kick before viciously finishing the job with a left cross after he beat the count.

At K-1 Star Wars '96 on October 18, 1996, Andy Hug beat Masaaki Satake by unanimous decision in a rather lackluster rematch of the 1993 Seidokaikan Karate World Cup final to win his third title in the span on five months, the WKA World Super Heavyweight (+95 kg/209 lb) Muay Thai strap.^[18][19] He finished out the year a perfect 8–0 with another unanimous decision win, this time over fellow karateka Musashi at K-1 Hercules '96 on December 8, 1996.

Twice consecutive Grand Prix runner-up (1997–1998)

Andy Hug's eight fight win streak was brought to an end by then-two-time K-1 Grand Prix champion Peter Aerts in the first of their four meetings at K-1 Kings '97 on March 16, 1997. Soundly beaten inside the opening stanza, he was hurt by Aerts' right hand a number of times before being put away with a combination of an uppercut and a knee. He then fought to a five-round split draw with Sam Greco at K-1 Braves '97 on April 29, 1997, before having his fourth and final battle with Mike Bernardo in his first WKA world super heavyweight title defence on June 7, 1997, at K-1 Fight Night '97 in Zurich. Bernardo registered a knockdown of Hug with a powerful left hook at the end of round two but it was not enough as Hug took the unanimous decision in the only fight of their 2–2 series to go the distance.^[20][21]

On July 20, 1997, at K-1 Dream '97, Andy Hug met Francisco Filho in a rematch almost six years in the making; Filho had KO'd Hug at the third round of the 5th Kyokushin World Open back in 1991. The fight started tense and cagey, with little to no action for the majority of round one until Filho, making his debut under kickboxing rules, landed the decisive strike, a perfectly timed counter right hook, which sent Hug crashing to the canvas in a state of unconsciousness at the 2:37 mark.

With a record of 1-2-1 that year, he entered the Grand Prix in relatively poor form but qualified for the final eight nonetheless with a win over Pierre Guénette at K-1 Grand Prix '97 1st round on September 7, 1997, putting away the Canadian taekwondo exponent with three knockdowns inside the first round. The round of eight went down on November 9 and saw the rubber match between Andy Hug and Masaaki Satake in the quarter-finals go just fifteen seconds as the Swiss dispatched his Japanese foe with a high kick. In the semis, Hug drew Peter Aerts and avenged his loss to the Dutchman eight months prior with a unanimous judges' decision victory. Having fought his way through to the final, he then lost to Ernesto Hoost by unanimous decision in the third of their four matches.^[22]

He rebounded with a unanimous decision victory over Curtis Schuster on April 9, 1998, at K-1 Kings '98 and then had his third meeting with Peter Aerts in Zurich on June 6, 1998, at K-1 Fight Night '98. With his WKA World Super Heavyweight Muay Thai Championship on the line, Hug outfought Aerts over the five rounds to take a unanimous decision and make the second defence of his belt. On August 7, 1998, at the K-1 USA Grand Prix '98, K-1's first venture into the United States and Las Vegas, he dismantled Mike LaBree inside the first round, forcing him into a corner before stopping him with a flurry of punches immediately followed by a thudding low kick.

The 1998 Grand Prix began on September 27 with the round of sixteen at the K-1 World Grand Prix '98 opening round where Hug faced off with Mark Russell, one of the few opponents in his career who he had a size advantage over. He scored a knockdown over England's Russell in the latter part of round one and finished the job in two with a second consecutive leg kick stoppage. In a tune-up fight ahead of the Grand Prix finals, Hug KO'd Masaaki Miyamoto with a spinning backfist moments after dropping him with the same technique at K-1 Japan '98 Kamikaze on October 28, 1998.

At the K-1 Grand Prix '98 Final Round on December 13, 1998, he TKO'd Ray Sefo in the second round of their quarter-final match, knocking the New Zealander down twice with aggressive boxing combinations and forcing referee Nobuaki Kakuda to stop the fight,^[23] before securing a majority decision against Sam Greco in the semis, a rematch of their draw a year earlier. There was also some controversy in the fight as both men continued to fight after the bell rung at the end of round two, with Greco knocking Hug to the canvas with a right hand. The tournament final saw Andy Hug draw Peter Aerts once again and in their fourth and final match against one another, Aerts emerged victorious via head kick knockout in the first round.^[22]

Later career and coaching (1999–2000)

1999 was the most successful year for K-1 since its inception. Record numbers of spectators were recorded for all tournaments. Around this time, Hug also turned his hand to training other competitors at his facility in Lucerne, Switzerland, bringing through the next generation of Swiss heavyweights in Xhavit Bajrami, Björn Bregy and Petar Majstorović as well as foreign talent such as Michael McDonald.

He began 1999 in devastating fashion, knocking out Tsuyoshi Nakasako with a second round spinning heel kick at K-1 Rising Sun '99 on February 3^[24] and scoring a second TKO over Ray Sefo in their rematch at K-1 Revenge '99 on April 25 when the New Zealander's corner pulled their fighter out at the end of round four due to damage sustained. During that fourth round, Sefo was down for over four minutes and was seen by ringside physicians after sustaining a low blow before suffering two knockdowns, one from a low kick and the other a barrage of unanswered strikes.^[25] Hug then registered back-to-back unanimous decision victories over Stefan Leko, in his third defence of the WKA strap at K-1 Fight Night '99 on June 5, and Maurice Smith, at K-1 Spirits '99 on August 22. Continuing his winning streak into the 1999 K-1 World Grand Prix, he floored Hiromi Amada twice with low kicks then finished him with a spinning heel kick in round one at the K-1 World Grand Prix '99 opening round on October 5. In the quarter-finals of the K-1 Grand Prix '99 final round, which was held on December 5, Hug met Ernesto Hoost for the fourth and last time. As early as the first round, Hug exacerbated a pre-existing groin injury. This handicap was so severe that it forced him to abandon a large part of his arsenal in his kicking game, and he dropped a unanimous decision.

Hug went 4–0 in 2000, the year of his death. He took a majority decision in his rematch with Musashi at K-1 Burning 2000 on March 19 and a unanimous decision against Glaube Feitosa after a back-and-forth war at K-1 The Millennium on April 23. In his Swiss retirement fight (his last fight in Switzerland) as well as his fourth and last WKA title defence, Hug defeated Mirko Cro Cop at K-1 Fight Night 2000 on June 3. Cro Cop put him under pressure with his boxing at numerous times, but Hug stayed active with his kicks and did enough to take the unanimous decision.

In what would prove to be his final match, Andy Hug scored a quick knockout over Nobu Hayashi at K-1 Spirits 2000 on July 7, 2000, sending his Japanese opponent to the canvas twice inside the first round. He was planning a retirement match and a move into acting in the near future at the time of his death.^[26]