Hopman Cup

Williams made her Australian Open preparation at the Hopman Cup representing United States with Mardy Fish. Williams missed the first tie against India, where Meghann Shaughnessy took her spot.^[1] Williams competed in the tie against Czech Republic represented by Tomáš Berdych and Lucie Šafářová, she played Šafářová in singles and won in three sets, taking the first set in a bagel and the third set in the twelfth game. She then paired with Fish and won after the Czech team retired after losing the first set in a bagel.^[2] In their third tie they took on Alicia Molik and Peter Luczak of Australia. Williams won her match against Molik, with a two break lead in the first and a second set tie-break. She and Fish then took the doubles in two easy sets. Winning all their three ties it send United States to the final. ^[3] In the final they faced Serbia against Jelena Janković and Novak Djokovic, Janković withdraw from the singles with an upper right leg injury, which gave USA the lead, however Fish lost to Djokovic pushing them to a decisive mixed doubles match. Williams and Fish won the doubles in a tie-break in the first and at two in the second, handing them the Hopman Cup trophy, Williams' second.^[4]

Australian Open

Williams came into the Australian Open with a 14-match winning streak, missing the 2006 edition and winning the 2005 and 2007 edition. Williams began her title defense facing Wild card Jarmila Gajdošová and won easily in straight sets winning both sets in three.^[5] She then took on Chinese qualifier Yuan Meng and once again came through it straight, this time dropping only four games.^[6] In the third round, she faced Victoria Azarenka, Williams won in straight sets aided by 15 aces she served in the match.^[7] In the following round, 12th seed Nicole Vaidišová was in her path in her title defense and once again Williams won in straight sets. In the final 8, Williams faltered against Jelena Janković losing in straight sets, Williams serve broke down as she was broken 7 times in the match. This ended Williams winning streak at the event at 18. This was her fourth straight loss in the quarterfinals of a Grand Slam singles tournament and the first time since the 2001 Wimbledon Championship where she completed a four-in-a-row loss in the quarterfinals of a slam.^[8]

Williams also played doubles with Venus Williams, they went into the quarterfinals without dropping a set defeating the teams of Monique Adamczak and Christina Wheeler, Katarina Srebotnik and Ai Sugiyama, and Maret Ani and Meilen Tu. In the quarterfinals they faced the Chinese pair of Yan Zi and Zheng Jie, however they fell in three sets after claiming the first set.

Canara Bank Bangalore Open

Williams, then played at the Canara Bank Bangalore Open. Williams as the third seed received a bye in the first round. In her opening match against Tzipora Obziler, after scrapping through the first set, Williams bageled Obziler in the second set. In her next match, she took on Russia's Anastasia Rodionova and cruised through dropping only five games. In the semifinals, she took on sister Venus Williams, Serena won the first set breaking Venus twice while getting broken once herself. Venus came back to win the second set. In the decider Serena broke Venus in the seventh game and served for it in the tenth game and had a match point, but Venus came back and had a match point herself at the twelfth game, which Serena saved to push it to a tie-break. Serena came through the tie-break to advance.^[9] In the final she took on Swiss Patty Schnyder, In the first set, Williams served for the set at the tenth game with two set points, but got broken, only to break back, and closed out the set in the twelfth game. Williams was then down by a break early in the second, just to win the next five games, serving it out in the ninth game to win the title.^[10]

Sony Ericsson Open

Williams next scheduled event was the Sony Ericsson Open. Being seeded, Williams received a bye into the second round, where she faced Edina Gallovits and won, only dropping three games. In the third round, she took on Italian Flavia Pennetta. The first set went to a tie-break, which the Italian won. Pennetta then won the first three games of the second, Williams then made a comeback winning 12 of the last 1four games to beat the Italian in three. There was a rain delay after the fifth game, Penneta up by a break, which Williams said helped her comeback in the match. Williams overcame 60 unforced errors in the match^[11] In the round of 16, Williams faced Estonia's Kaia Kanepi and won easily in straight sets, winning both sets in three.^[12] In the final 8, she faced world no. 1 Justine Henin, in a rematch of the previous year's final. The match went on serve for the first four games, before Williams reeled in ten straight games to advance.^[13] In the semifinals, Williams took on world no. 4 Svetlana Kuznetsova. Kuznetsova took the first set breaking Williams twice while getting broken once herself. In the second set, Williams broke Kuznetsova in the 11th game and served it out in the following game to go to a decider. Williams then made the decisive break in the 8th game and closed it out in the 9th game to go through.^[14] In the final, Williams faced 3rd ranked Jelena Janković, Williams took the first set in a breadstick. In the second set Williams took the first three games and served for the match at the tenth game, but Janković came back and won the last three games to push it to a decider. Williams then won the first five games of the third set, Janković came back, before Williams could close it out in her 8th match point at the 9th game. Williams claims her fifth Miami title, tying her with Steffi Graf for most titles in the tournament.^[15]

Family Circle Cup

Williams began her clay preparations at Family Circle Cup. As the fifth seed, Williams received a bye in the first round. In the first round she won in straight sets against Frenchwoman Gisela Dulko. In the second round, she took on Katarina Srebotnik and came back winning in three after losing the first set. In the following round, Williams faced second seed Maria Sharapova, Williams won the first set in the twelfth game and then lost the second set with a single break advantage for the Russian. Williams then cruised in the third set dropping only a game.^[16] In the final 4, Williams defeated surprise semifinalist Alizé Cornet in straight sets.^[17] In the final, Williams faced Russian Vera Zvonareva. Williams took the first set when she broke Zvonareva in the first set and the held proceedings. Zvonareva then came back in the second when she broke in the sixth game with a Williams double fault, Zvonareva took advantage and won the second set to force a decider. In the final set, Williams was broken early, just to broken back. Williams then made the decisive break in the eight game and then serve it out to win her first Charleston title.^[18]

Qatar Telecom German Open

Her next scheduled event was the Qatar Telecom German Open. She received a bye to advance to the second round to face Francesca Schiavone, Williams cruised pass the Italian losing five games in the process. In the following round, she took on Agnieszka Radwańska and cruised, losing only four games. In the quarterfinals, she faced Russian Dinara Safina, Williams took the first set dropping only two games, Safina came back to take the second. The third set then went to decisive tie-break which Safina won. This loss ends Williams 17 match winning streak.^[19]

Internazionali BNL d'Italia

Williams made her final French Open preparation at the Internazionali BNL d'Italia. After receiving a bye in the first round, Williams won easily against Alona Bondarenko losing only two games, winning the second set in a bagel. In the next round, she faced Italian wildcard Sara Errani and won in straight sets with a break advantage in each.^[20] Williams was bound to face Alizé Cornet in the quarterfinal, when she withdrew before the match with a back injury.^[21]

French Open

Williams was the fifth-seeded player at the French Open. She was the only former winner of this tournament in this year's draw, following the sudden retirement of four-time champion Justine Henin. Williams began her campaign for a second French Open against compatriot Ashley Harkleroad, who she beat convincingly dropping only three games.^[22] In the second round, Williams defeated wild card Mathilde Johansson, cruising through the first set and was pushed to 1two games in the second set.^[23] In the round of 32, Williams took on Katarina Srebotnik. Williams was broken early just to break back to go back on serve. Srebotnik took advantage of the error-prone Williams to break and closed it out in the tenth game. In the second set, Williams had break points in three of Srebotnik's service games but failed to break. Srebotnik then won the second in the tenth game to produce the upset.^[24]

Bank of the West Classic

Williams made her preparation for the Summer Olympics and US Open at the Bank of the West Classic. Williams received a bye in the first round and faced 15-year-old qualifier Michelle Larcher de Brito. Williams took an early break lead, until Larcher de Brito won six games in a row to take a set and the first two games of the second set. Williams then came back winning 12 of the last 1five games to go through.^[33] In the last 8, unlike her opening match, she cruised pass Patty Schnyder in straight sets with a drop of four games. In the semifinal, Williams retired against surprise semifinalist and qualifier Aleksandra Wozniak while trailing by a set and break due to a left knee injury.^[34]

East West Bank Classic

Williams withdrew from the East West Bank Classic due to the same knee injury she retired from the previous tournament.^[35]

Summer Olympics

Williams came into the Summer Olympics, trying to claim her first singles gold. In her opening match she took Belarus' Olga Govortsova and was a set and on serve in the third game when the match was suspended due to rain. In the resumption the next day Williams won the four games to take the in second set in a breadstick and win.^[36] In her next match, she faced Australia's Samantha Stosur and made quick work of her opponent winning in just 44 minutes and a loss of two games, winning the second set in a bagel. ^[37] In her third round match, she was pushed by France's Alizé Cornet, Williams dropped the opening, but came back to win the next two, to advance. In the last 8, Williams took on Russia's Elena Dementieva, Williams took the first set in the ninth game. Dementieva then battled back to take the second in the tenth game. In the final set, the Russian raced through the first five games, winning them all, before Williams could racked in three herself. However, Dementieva was able to close it out in the ninth game.^[38]

In the doubles, she and sister Venus Williams was one of the two teams player for the United States. It is their second Olympics as a team, having won in 2000 and missing the 2004 edition. In the first round they faced the Czech pairing of Iveta Benešová and Nicole Vaidišová, the Czech pair took the first set with a single break. The second set was tight but the Williams sisters were able to come through, breaking in the 11th game and holding serve to push it to a decider. The Williams sisters then dominated the last set with a breadstick. In their next two matches, they won in straight sets against the Japan's Ayumi Morita and Ai Sugiyama, and the Russian pairing of Elena Vesnina and Vera Zvonareva. In the semifinals they faced the Australian Open doubles champions Ukraine's Alona Bondarenko and Kateryna Bondarenko. The first set was won by the Bondarenko sisters with an advantage of a single break, the Williams sisters came back with the same scoreline in the second set and then dominated the third with a breadstick. In the battle for the Gold medal the faced Spanish French Open champions Anabel Medina Garrigues and Virginia Ruano Pascual and cruised to their second gold medal with a drop of only two games including a bagel in the first set. This is their second doubles gold and stays undefeated at the Olympics as a pair^[39]

US Open

Williams practicing at the US Open.

Williams came into the US Open as the world no. 3, and was one of seven contenders to claim the number 1 ranking. Williams was also trying the title for the first time in six years. Williams began her tournament against Ukraine's Kateryna Bondarenko and cruised in straight set. She recorded six aces and won 92 percent of the points on her first serve.^[40] Williams, in her second round match took on Russia's Elena Vesnina and won with a double breadstick victory.^[41] In the following round, she faced 30th seed Ai Sugiyama and cruised in a 66 minutes straight sets win.^[42] In the fourth round, Williams cruised pass French wild card Séverine Brémond in straight sets winning both sets in two.^[43] In the final 8, Williams took on sister Venus Williams in their 17th meeting. In the first set Venus had the advantage serving for the set at the tenth game, however younger sister Serena came back to push it to a tie-break. Venus then had two set points in the tie-break, but Serena reeled in four straight points to win the set. In the second set, once again Venus served for the set in the ninth game and had three set points, just to see Serena save them all and save another one at the twelfth game to push to another tie-break. Venus then had another three set points in the tie-break, just to see Serena win 6 of the last 7 points to win the match.^[44] In the semifinals, Williams faced French Open finalist Dinara Safina, Safina took an early lead winning the first two games, just to see Williams come back breaking her in the fourth and eight game and served the set out in the ninth game saving two break points. Williams then cruised in the second set winning it in two.^[45] In her first final since 2002, Williams took on Jelena Janković for the title and the number 1 ranking. In the first set, Williams took control with a single break lead. The second set was a turn-around, Janković had her chances she had three set points in the Williams serve in the ninth game and served for the set in the tenth game. However, Williams came back and broke Janković in the tenth and twelfth game to win her third US Open title and ninth slam without dropping a set. Williams finished with 44 winners, offsetting her 39 unforced errors, while Janković had 15 winners and 22 unforced errors. The win also gave Williams the number 1 ranking.^[46][47]

Porsche Tennis Grand Prix

Williams then played the Porsche Tennis Grand Prix as the world no. 1. After receiving a bye in the first round, she faced Li Na. Williams won the first set in a bagel, then lost the second set in a breadstick. The third set went to Li with a single break advantage. The loss meant that Williams will loss her number 1 ranking.^[48]

In the doubles, she and sister Venus won in straight sets against Daniela Hantuchová and Ágnes Szávay before withdrawing in their match against Andrea Hlaváčková and Lucie Hradecká because of a left ankle injury to Serena

Kremlin Cup

Williams then withdrew from the Kremlin Cup citing a continuing left ankle injury and a desire to give her body time to recover from a packed playing schedule.^[49]

WTA Tour Championships

Williams being the third seed was drawn with Dinara Safina, Elena Dementieva, and Venus Williams. Williams played Safina first and won comfortably in straight sets. In her second round robin match, she took on sister Venus, Serena took the first set in the twelfth game. However, from then on Serena only won a game losing the next to in a breadstick and a bagel. Handing the first bagel in the Williams sisters rivalry.^[50] Williams then pulled out with a stomach injury before her match against Dementieva and was replaced by Nadia Petrova.^[51]

Singles: 5 (4–1)

Outcome	No.	Date	Championship	Surface	Opponent in the final	Score in the final
Winner	29.	March 9, 2008	Bangalore, India (1)	Hard	Patty Schnyder	7–5, 6–3
Winner	30.	April 5, 2008	Miami, US (5)	Hard	Jelena Janković	6–1, 5–7, 6–3
Winner	31.	April 20, 2008	Charleston, US (1)	Clay (green)	Vera Zvonareva	6–4, 3–6, 6–3
Runner-up	12.	July 5, 2008	Wimbledon, London, UK (2)	Grass	Venus Williams	5–7, 4–6
Winner	32.	September 7, 2008	US Open, New York City, US (3)	Hard	Jelena Janković	6–4, 7–5

Doubles: 4 (4–0)

Outcome	No.	Date	Championship	Surface	Partner	Opponent in the final	Score in the final
Winner	12.	July 5, 2008	Wimbledon, London, UK (3)	Grass	Venus Williams	Lisa Raymond Samantha Stosur	6–2, 6–2
Winner	13.	August 17, 2008	Summer Olympics, Beijing, China (2)	Hard	Venus Williams	Anabel Medina Garrigues Virginia Ruano Pascual	6–2, 6–0