2007 WTA Tour

The 2007 Sony Ericsson WTA Tour was the elite professional tennis circuit organized by the Women's Tennis Association (WTA) for the 2007 tennis season. The calendar comprises the Grand Slam tournaments (supervised by the International Tennis Federation (ITF)), the WTA Tier I-IV Events, the Fed Cup (organized by the ITF) and the year-end championships.

Justine Henin put together an exceptional season, winning 10 out of the 14 events she entered. This included her sixth and seventh Grand Slam titles at the French Open and U.S. Open, whilst compiling a 63–4 win–loss record. Following her loss to Marion Bartoli in the Wimbledon semifinals she went undefeated for the rest of the year, in the process becoming the first woman to earn over $5 million in a single season.

Meanwhile, the Williams sisters returned to the forefront of tennis after years of injury struggles, with both finishing the season in the top ten, the first time since 2004 that Serena Williams finished in the upper elite in the rankings. Serena's emphatic victory at the Australian Open, ranked No. 81, surprised the tennis world. Venus Williams won her fourth Wimbledon title and sixth Grand Slam overall, becoming the lowest ranked woman to win at Wimbledon.

The season saw two former world No. 1s retire and another one make her return. Kim Clijsters cut her farewell tour short by retiring abruptly in May, having originally been due to play her last event in October. She later returned in 2009. Martina Hingis was forced to quit after she admitted that she had tested positive for cocaine. However, Lindsay Davenport made a successful return to the tour following her pregnancy and won two tournament titles in the latter half of the season.

Serena Williams started the season by unexpectedly winning her eighth singles Grand Slam title at the Australian Open. Many critics and commentators had already written her off, questioning her desire and fitness, especially after an early loss in her only warm-up tournament the week before. Williams won the title in emphatic fashion, thrashing Maria Sharapova in the final in a performance that BBC Sport called "arguably the most powerful display ever seen in women's tennis." In her earlier matches she was pushed by Nadia Petrova in round three and then by Shahar Pe'er in the quarterfinals. Defending champion Amélie Mauresmo suffered an early loss to Lucie Šafářová, allowing Nicole Vaidišová to reach her second Grand Slam semifinal. Despite losing in the final, Sharapova managed to return to the No. 1 ranking for the second time.

After withdrawing from the Australian Open due to marital problems, Justine Henin returned for Paris in February. She later won titles in Dubai and Doha that month. Kim Clijsters bade a tearful farewell to her home crowd in Belgium, playing Antwerp for the final time due to her planned retirement in October. She lost the final to Amélie Mauresmo, who won the unique diamond racket for winning the event three times. Martina Hingis won the title in Tokyo for her fifth win at that tournament, more than any other player. Venus Williams returned from missing the Australian Open with a wrist injury by winning a smaller tournament in Memphis.

In March, Daniela Hantuchová overcame a five-year hiatus between tour titles to win Indian Wells, the same event where she won her first title at in 2002. Sharapova lost to Vera Zvonareva in the fourth round and thus surrendered her No. 1 position back to Henin. Elsewhere Serena Williams backed up her Australian Open triumph with a win in Miami, saving match points against Henin in the final.

Serbians Jelena Janković and Ana Ivanovic dominated the clay season leading up to the French Open, winning the three biggest warm-up tournaments. Janković took the titles at Charleston and Rome, while Ivanovic won in Berlin. Svetlana Kuznetsova was the runner-up in the latter two events. Also during the clay court season Kim Clijsters announced her retirement, months earlier than anticipated, following an early loss in Warsaw. The finish to the clay season saw Henin pick up her fourth French Open title, and sixth Slam overall. She defeated a nervous Ana Ivanovic, in her maiden Grand Slam final, in only an hour and five minutes.