Juniors

As a junior, Fish compiled a 58–25 singles win–loss record (32–19 in doubles), reaching as high as No. 14 in the world in 1999 (and No. 19 in doubles).

2000–2005

Fish turned professional in 2000 at the age of 18. He spent his first few years as a pro playing in the Challenger and Futures circuits. He earned his first title on the ATP Tour in 2002 playing doubles in the U.S. Men's Clay Court Championships in Houston, Texas, with Andy Roddick.

Fish's career improved significantly in 2003, when he won his first ATP singles title and reached the biggest final of his career in Cincinnati. His singles victory came near the end of the season, when he defeated Robin Söderling to win the Stockholm Open in Stockholm, Sweden. In addition, he defeated fifth-seeded and former world no. 1 Carlos Moyà at the 2003 Australian Open in the second round, 3–6, 7–6, 6–4, 4–6, 6–2. He finished the year ranked no. 20 in the world.

Fish played well in 2004, reaching the finals at the SAP Open in San Jose, California and in the Gerry Weber Open in Halle, Germany. At the 2004 Summer Olympics, Fish earned a silver medal having defeated Juan Carlos Ferrero and Fernando González to reach the final. He lost the final in five sets to Chilean Nicolás Massú.

In 2005, Fish injured his left wrist. It eventually required two surgeries, and as a result, he played just 17 matches in the year.

2006

Fish was awarded a wildcard in April into the US Men's Claycourt Championships. He won the tournament, defeating eighth seed Juan Mónaco, Rainer Schüttler, Vince Spadea, Tommy Haas, and Jürgen Melzer in the final 3–6, 6–4, 6–3.

At Wimbledon, Fish signaled his return to professional status as he reached the third round, defeating fellow American Robby Ginepri and Dutch player Melle van Gemerden. The night prior to his third-round match, he suffered from food poisoning. He could play only one set before retiring against Georgian Irakli Labadze.

2007

Fish began 2007 by achieving his best finish at a Grand Slam. Fish reached the quarterfinals of the Australian Open, losing to his old roommate and doubles partner, Andy Roddick. Fish made waves on the first day of the tournament by knocking off Ivan Ljubičić, the fourth seed, and had an easy win in the third round when his heavily favoured opponent Wayne Arthurs retired in the opening set. Fish had few problems in his first four matches, but lost in straight sets to Roddick. As a result, he moved up by 17 places in the ATP rankings.

Fish at Roland Garros

2008

Fish started off 2008 quite well at the Hopman Cup, an exhibition event in Perth, Western Australia. Partnering with Serena Williams, he won the title. Williams was ill and arrived after the start of the event, but Meghann Shaughnessy filled in for the first match. Fish won against Indian Rohan Bopanna and Australian Peter Luczak, and received a walkover from Czech Tomáš Berdych. Although Fish lost the first doubles match, he and Williams were undefeated in two mixed doubles matches. They qualified as undefeated for the final, where they faced top-seeded Serbians Novak Djokovic and Jelena Janković. Although Fish lost in singles against Djokovic, the Americans again won the mixed doubles match to win the title.

Fish fell to Jarkko Nieminen in the third round of the Australian Open after a code violation caused him to lose his composure.

Fish then went on to make a quarterfinal showing at the 2008 Delray Beach International Tennis Championships, before losing to long-time friend and wild-card entry Robby Ginepri.

At the Pacific Life Open in Indian Wells, California, Fish defeated world no. 1 Roger Federer in the semifinals in what Fish described as "a great win,"^[5] after failing to beat the Swiss player in five previous matches. However, Fish lost in the final to Novak Djokovic, the third seed.

At the French Open, Fish lost in the second round to 25th-seeded Lleyton Hewitt with Fish committing 58 unforced errors, compared to Hewitt's twelve.^[6]

At Wimbledon, Fish lost in the first round to eighth-seeded Richard Gasquet.^[7]

At the US Open, Fish reached the quarterfinals, before losing to Rafael Nadal.

2009

Fish at Delray Beach

Fish won his fifth doubles title, partnering Mark Knowles of the Bahamas at the Regions Morgan Keegan Championships in Memphis. The next week, ranked as the top seed, he won his third singles title at the Delray Beach International Tennis Championships against first-time finalist Evgeny Korolev.

In the 2009 BNP Paribas Open, Fish received a first-round bye, only to be eliminated in the second round by unseeded Frenchman Jérémy Chardy. However, he captured his sixth doubles title and first ATP Masters Series 1000 title with partner Andy Roddick.

In April, Fish played in the 2009 U.S. Men's Clay Court Championships, but was knocked out in the first round by Björn Phau of Germany. He then played in the 2009 Rome Masters, where he lost in the second round to Fernando Verdasco.

Fish advanced to the third round in Wimbledon men's singles, where he fell to Novak Djokovic in straight sets. In doubles, he and partner James Blake advanced to the semifinals, before losing to the defending and eventual champions Daniel Nestor and Nenad Zimonjić.

In July, Fish competed in the Davis Cup against Croatia, losing to Marin Čilić in five sets.

On August 30, Fish withdrew from the 2009 US Open, where he was seeded 25th, citing a rib injury.^[8]

2010

Fish began 2010 by winning the SAP Open in San Jose with doubles partner Sam Querrey. The pair defeated Benjamin Becker and Leonardo Mayer, 7–6, 7–5, in the final. With this win, Fish improves to 7–1 lifetime in ATP World Tour doubles finals. On March 27, Fish knocked his second round opponent Andy Murray out of the Sony Ericsson Open in Miami, Florida, in straight sets^[9] On June 10, Fish played Andy Murray again in the third round of the Queen's tournament in London. Fish won the first set 6–4, but lost the second 6–1. However, during the third set, Fish was leading 3–0, Murray then brought it back to 3–3. Fish then complained to the umpire that it was too dark, and he then walked off the court without talking to Murray. Murray stayed on the court for a few minutes after the incident and said, "He only complained because I was gaining momentum", and "He wouldn't have complained when he was 3–0 up." The following day, Fish went on to win the third and final set in a 6–4, 1–6, 7–6 victory. He faced Michaël Llodra in the quarterfinals and Feliciano López in the semifinals to reach the final. He lost to compatriot Sam Querrey to finish as runner-up.

At Wimbledon, he lost in the second round to Florian Mayer, 6–7, 6–3, 6–4, 6–4.^[10] After Wimbledon, he participated in the last grass-court event of the year, the Hall of Fame Tennis Championships in Newport. He won his fourth title, and first on grass, over Belgian Olivier Rochus in three sets.^[11] As a result, his ranking jumped up to the top 50 at 49.^[1] He proceeded to win a second straight title, which was also his second of the year and first on hard courts, at the Atlanta Tennis Championships. It was the first tournament in Atlanta in over a decade, and in the semifinal and final rounds, Fish defeated Andy Roddick (whom he had not beaten in eight consecutive career meetings), who was the top seed, and John Isner, who played collegiate tennis for nearby University of Georgia.^[12]

In Fish's return to the Western & Southern Financial Group Masters in Cincinnati, he advanced over former world no. 6 Gilles Simon, over world no. 8 Fernando Verdasco, over former world no. 7 Richard Gasquet, and over world no. 4 Murray to reach the semifinals, where he defeated former world no. 1 Andy Roddick, 4–6, 7–6, 6–1. He was edged by world no. 2 Roger Federer, 6–7, 7–6, 6–4, in the final, but jumped into the top 25 in the world rankings.^[13]

2011

Fish opened his season at the 2011 Brisbane International, falling in the second round to Stepanek, 3–6, 1–6. Fish then fell in the second round to Tommy Robredo, 6–1, 3–6, 3–6, 3–6, at the 2011 Australian Open.

He made the semifinals at his next two tournaments; 2011 Delray Beach International Tennis Championships, losing to resurging, eventual champion Juan Martín del Potro, and at the 2011 Regions Morgan Keegan Championships losing to fast-rising Canadian youngster Milos Raonic in three sets.

After a first-round bye in the 2011 BNP Paribas Open, he fell in the second round again to Milos Raonic, 5–7, 4–6. At the 2011 Sony Ericsson Open, Fish found some rich vein of form, collecting wins over Julien Benneteau, Richard Gasquet, and notably reached the quarterfinals by winning against Juan Martín del Potro, 7–5, 7–6, who only a few weeks earlier had defeated Fish in Delray Beach. By defeating del Potro and reaching the quarterfinals in Miami, Mardy Fish overtook Andy Roddick as the highest-ranked American player on the tour. Fish's campaign continued, as he upset ATP world no. 6 David Ferrer, 7–5, 6–2, before falling to world no. 2 Novak Djokovic in the semifinals of the Sony Ericsson Open. He entered the top 10 for the first time on April 18, despite not playing, because Fernando Verdasco did not defend his Monte Carlo points.

Fish reached the third round of the 2011 French Open, his best result at the tournament so far. He was beaten by Gilles Simon, 3–6, 4–6, 2–6.

Fish reached the quarterfinals at Wimbledon for the first time, after beating the 2010 finalist Tomáš Berdych in straight sets. He lost to world no. 1 Rafael Nadal, 6–3, 6–3, 5–7, 6–4. At the 2011 Farmers Classic on July 31, 2011, Fish faced Ernests Gulbis for the title, having defeated fellow American teenager Ryan Harrison in the semifinals. He finished runner-up to Gulbis, 7–5, 4–6, 4–6. This dropped him to a 6–13 mark in ATP World Tour finals. The following week, he withdrew from Washington, D.C., citing a heel injury sustained during the Farmers Classic final.

In August at the 2011 Rogers Cup, Fish reached his fourth Masters series final, defeating Feliciano López, Ernests Gulbis, Stanislas Wawrinka, and Janko Tipsarević, 6–3, 6–4, in the semifinal. In the final, Fish faced world no. 1 Novak Djokovic, who was looking to extend his season record to 53–1. He lost to Djokovic, 2–6, 6–3, 4–6, in the final, saving three match points to come up from 0–40 in the final game. Fish rose to a career-high ranking of no. 7.

Fish continued his impressive run on the American hard courts with a comfortable 6–0, 6–2 victory in the second round of the 2011 Western & Southern Open against former world no. four Nikolay Davydenko. In the quarterfinal, he defeated Rafael Nadal, 6–3, 6–4. This was Fish's first win against Nadal. He faced world no. 4 Andy Murray in the semifinal. Fish lost, 3–6, 6–7, after a thrilling second-set tiebreak. In the 2011 US Open, he advanced to the fourth round by beating German Tobias Kamke and qualifier Malek Jaziri in straight sets in the first two rounds, and South African Kevin Anderson in straight sets with two tiebreakers in the third round. Fish was subsequently eliminated in the fourth round of the tournament by world no. 11 Jo-Wilfried Tsonga.

He reached the semifinals in Tokyo in October, defeating Ryan Harrison, Ernests Gulbis, and Bernard Tomic, before falling to Rafael Nadal.

He played for the first time in the Barclays ATP World Tour Finals, but was eliminated in the round-robin stage.

2012

Fish went down in the second round of the 2012 Australian Open to Colombian Alejandro Falla. He made it to the third round of Indian Wells, before being defeated by Australian Matthew Ebden.

He reached the quarterfinals in Miami, but was defeated by Juan Mónaco, 1–6, 3–6.^[14] Citing fatigue, he did not play any of the European clay-court season and withdrew from the 2012 French Open.^[15] What he did not tell the media until later is that immediately after his last match in Miami, he was taken to the hospital with severe cardiac arrhythmia. On May 23, he underwent a cardiac catheter ablation in Los Angeles to correct faulty electrical connections in his heart, in which those spots were cauterized in order to prevent short circuiting. He later stated that his condition had made it hard for him to sleep, and his heart felt like it was going to burst out of his chest.^[16] His condition was also very difficult mentally and emotionally, with periods when he could not stand to be alone.

Fish's first tournament back was the 2012 Wimbledon Championships, where he was seeded 10th. His run at Wimbledon was cut short when he lost to fifth seed Jo-Wilfried Tsonga in the fourth round in four sets.^[17]

Fish did not compete in the 2012 Summer Olympics.^[18] He instead played at the Citi Open in Washington, D.C., where he was the top seed and reached the semifinals.

In the 2012 US Open Fish was the 23rd seed. He defeated Go Soeda, Nikolay Davydenko, and Gilles Simon before withdrawing for health reasons before his fourth-round match with top seed Roger Federer.^[19][20]

Fish did not play on tour for the rest of the season and announced before the end of the year that he would not play in the Australian Open.

2013–2015

Mardy's first tournament of the 2013 season was Indian Wells in March. He received a bye to the second round and defeated qualifier Bobby Reynolds in three sets. He lost in the third round against Jo-Wilfried Tsonga. Fish did not play an ATP match again until Atlanta in July. In his first tournament back, he lost in the first round to Michael Russell in a hard-fought match. In Washington, D.C. the following week, he won his first match against Matthew Ebden, before being downed by Julien Benneteau. He also played doubles in this event, teaming with Radek Štěpánek and making it to the final, where he again lost to Benneteau, teamed with Nenad Zimonjić. After winning his first-round match in Winston-Salem, he retired in the third set against Jarkko Nieminen, citing heat stroke.^[21] The next day, he announced that he would not be playing the US Open.^[22][23]

Fish did not play on Tour during 2014, due to an anxiety disorder.^[24] In June 2014 Fish had a cardiac catheter ablation operation to correct misfiring electric pulses in his heart. He made a return to competitive tennis in February 2015 at the Tennis Championship of Dallas, competing with Mark Knowles in the doubles tournament. He also received a protected ranking for the Indian Wells Masters, but lost in the first round to Ryan Harrison.^[25]

Fish appeared again on tour in July 2015 in Atlanta, but again lost in the first round of singles. Playing doubles with Andy Roddick, he won his first-round match. He also won his first-round match of doubles in Washington, D.C., partnering Grigor Dimitrov, but they conceded a walkover in the second round. In Cincinnati, Fish won his first singles match since 2013 against Victor Troicki. However, he faced Andy Murray in the second round, and lost in straight sets, with a tiebreak in the second set. He also teamed with Tomáš Berdych in doubles, but they lost their first match. He announced that he would retire after the US Open. At the US Open, he defeated Marco Cecchinato in the first round. He lost in the second round in a valiant five-set battle with 18th seed and eventual quarterfinalist Feliciano López.^[26]

Olympic Games

Singles: 1 (1 silver medal)

Outcome	Year	Championship	Surface	Opponent	Score
Silver	2004	Summer Olympics	Hard	Nicolás Massú	3–6, 6–3, 6–2, 3–6, 4–6

Masters 1000 finals

Singles: 4 (0–4)

Outcome	Year	Championship	Surface	Opponent	Score
Runner-up	2003	Cincinnati Masters	Hard	Andy Roddick	6–4, 6–7(3–7), 6–7(4–7)
Runner-up	2008	Indian Wells Masters	Hard	Novak Djokovic	2–6, 7–5, 3–6
Runner-up	2010	Cincinnati Masters (2)	Hard	Roger Federer	7–6(7–5), 6–7(1–7), 4–6
Runner-up	2011	Canadian Open	Hard	Novak Djokovic	2–6, 6–3, 4–6

Doubles: 2 (1–1)

Outcome	Year	Championship	Surface	Partner	Opponents	Score
Winner	2009	Indian Wells Masters	Hard	Andy Roddick	Max Mirnyi Andy Ram	3–6, 6–1, [14–12]
Runner-up	2011	Italian Open	Clay	Andy Roddick	John Isner Sam Querrey	walkover

Singles: 20 (6 titles, 14 runner-ups)

Result	W–L	Date	Tournament	Tier	Surface	Opponent	Score
Loss	0–1	Mar 2003	Delray Beach Open, US	International	Hard	Jan-Michael Gambill	0–6, 6–7(5–7)
Loss	0–2	Jun 2003	Nottingham Open, UK	International	Grass	Greg Rusedski	3–6, 2–6
Loss	0–3	Aug 2003	Cincinnati Masters, US	Masters	Hard	Andy Roddick	6–4, 6–7(3–7), 6–7(4–7)
Win	1–3	Oct 2003	Stockholm Open, Sweden	International	Hard (i)	Robin Söderling	7–5, 3–6, 7–6(7–4)
Loss	1–4	Feb 2004	Pacific Coast Championships, US	International	Hard (i)	Andy Roddick	6–7(13–15), 4–6
Loss	1–5	Jun 2004	Halle Open, Germany	International	Grass	Roger Federer	0–6, 3–6
Loss	1–6	Aug 2004	Olympic Games, Greece	Olympics	Hard	Nicolás Massú	3–6, 6–3, 6–2, 3–6, 4–6
Win	2–6	Apr 2006	U.S. Men's Clay Court Championships, US	International	Clay	Jürgen Melzer	3–6, 6–4, 6–3
Loss	2–7	Aug 2007	Connecticut Open, US	International	Hard	James Blake	5–7, 4–6
Loss	2–8	Mar 2008	Indian Wells Masters, US	Masters	Hard	Novak Djokovic	2–6, 7–5, 3–6
Loss	2–9	Aug 2008	Connecticut Open, US	International	Hard	Marin Čilić	4–6, 6–4, 2–6
Loss	2–10	Feb 2009	Pacific Coast Championships, US	250 Series	Hard (i)	Radek Štěpánek	6–3, 4–6, 2–6
Win	3–10	Mar 2009	Delray Beach Open, US	250 Series	Hard	Evgeny Korolev	7–5, 6–3
Loss	3–11	Jun 2010	Queen's Club Championships, UK	250 Series	Grass	Sam Querrey	6–7(3–7), 5–7
Win	4–11	Jul 2010	Hall of Fame Tennis Championships, US	250 Series	Grass	Olivier Rochus	5–7, 6–3, 6–4
Win	5–11	Jul 2010	Atlanta Open, US	250 Series	Hard	John Isner	4–6, 6–4, 7–6(7–4)
Loss	5–12	Aug 2010	Cincinnati Masters, US	Masters 1000	Hard	Roger Federer	7–6(7–5), 6–7(1–7), 4–6
Win	6–12	Jul 2011	Atlanta Open, US (2)	250 Series	Hard	John Isner	3–6, 7–6(8–6), 6–2
Loss	6–13	Jul 2011	Los Angeles Open, US	250 Series	Hard	Ernests Gulbis	7–5, 4–6, 4–6
Loss	6–14	Aug 2011	Canadian Open, Canada	Masters 1000	Hard	Novak Djokovic	2–6, 6–3, 4–6

Doubles: 11 (8 titles, 3 runner-ups)

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Apr 2002	U.S. Men's Clay Court Championships, US	International	Clay	Andy Roddick	Jan-Michael Gambill Graydon Oliver	6–4, 6–4
Win	2–0	Feb 2004	Pacific Coast Championships, US	International	Hard (i)	James Blake	Rick Leach Brian MacPhie	6–2, 7–5
Win	3–0	Apr 2004	U.S. Men's Clay Court Championships, US (2)	International	Clay	James Blake	Rick Leach Brian MacPhie	6–3, 6–4
Loss	3–1	Feb 2006	U.S. National Indoor Tennis Championships, US	Intl. Gold	Hard (i)	James Blake	Chris Haggard Ivo Karlović	6–0, 5–7, [5–10]
Win	4–1	Jul 2008	Hall of Fame Tennis Championships, US	International	Grass	John Isner	Rohan Bopanna Aisam-ul-Haq Qureshi	6–4, 7–6(7–1)
Win	5–1	Feb 2009	U.S. National Indoor Tennis Championships, US	500 Series	Hard (i)	Mark Knowles	Travis Parrott Filip Polášek	7–6(9–7), 6–1
Win	6–1	Mar 2009	Indian Wells Masters, US	Masters 1000	Hard	Andy Roddick	Max Mirnyi Andy Ram	3–6, 6–1, [14–12]
Win	7–1	Feb 2010	Pacific Coast Championships, US (2)	250 Series	Hard (i)	Sam Querrey	Benjamin Becker Leonardo Mayer	7–6(7–3), 7–5
Win	8–1	Aug 2010	Washington Open, US	500 Series	Hard	Mark Knowles	Tomáš Berdych Radek Štěpánek	4–6, 7–6(9–7), [10–7]
Loss	8–2	May 2011	Italian Open, Italy	Masters 1000	Clay	Andy Roddick	John Isner Sam Querrey	Walkover
Loss	8–3	Aug 2013	Washington Open, US	500 Series	Hard	Radek Štěpánek	Julien Benneteau Nenad Zimonjić	6–7(5–7), 5–7

Singles

*Fish withdrew from the 2012 US Open prior to his fourth-round match (not counted as a loss)

Doubles

Current through the 2012 ATP World Tour Finals.