Singles Doubles The 2015 WTA Finals took place at the Singapore Indoor Stadium from 26 October to 1 November 2015, and was the 45th edition of the event.

[4] In 2015, Serena Williams decided to start her season at the exhibition event in Perth, at the Hopman Cup teaming up with John Isner, losing in the final to the Polish pairing of Agnieszka Radwańska and Jerzy Janowicz.

[7] She then claimed her eighth Miami Open title defeating Carla Suárez Navarro in just 56 minutes in the final after winning a tough three-set semifinal match against Simona Halep.

[10] Williams returned from an elbow injury in Toronto but was shocked by Swiss teen Belinda Bencic in the semifinals.

[11] At the US Open, Williams had a chance to win the calendar Grand Slam but was upset by Roberta Vinci in three sets in the semifinals.

[17] However, Halep suffered a dip in form losing to Mirjana Lučić-Baroni in the second round of the French Open and a first-round loss at Wimbledon to Jana Čepelová.

Halep rebounded at the US Open Series by reaching back-to-back finals at Toronto and Cincinnati, retiring against Belinda Bencic and losing to Serena Williams, respectively.

At the Australian Open Sharapova saved two match points to beat Alexandra Panova and the second round and went on to reach the final, where she lost to Serena Williams in straight sets.

Sharapova rebounded by reaching the semifinals of Madrid, losing to Svetlana Kuznetsova and winning Rome, beating Carla Suárez Navarro in the final.

However, this success did not carry over into the French Open where as the defending champion she lost in the fourth round to eventual finalist Lucie Šafářová.

Muguruza lost in the quarterfinals of Sydney to Angelique Kerber and the fourth round Australian Open to Serena Williams.

She began the year reaching the semifinals in Shenzhen and claiming her 15th career title by beating compatriot Karolína Plíšková in the final of Sydney.

On clay, Kvitová fell early to Madison Brengle in Stuttgart but less than two weeks later, she beat Serena Williams for the first time in her career en route to winning the title at Madrid.

However, she rebounded spectacularly by defending her title at New Haven and achieving her career-best result at Flushing Meadows by reaching the quarterfinals.

[22] Agnieszka Radwańska began 2015 by competing at the Hopman Cup, where she claimed the title for Poland with Jerzy Janowicz defeating Americans Serena Williams and John Isner.

[23][24] Angelique Kerber started her season by reaching the quarterfinals at the Brisbane International, where she lost to Elina Svitolina.

81 Francesca Schiavone in Antwerp which prompted Kerber to split with coach Benjamin Ebrahimzadeh and reunite with Torben Beltz.

She rebounded by winning her biggest career title to date at Doha by beating Victoria Azarenka in the final in straight sets.

Šafářová then advanced to her first ever Grand Slam singles final at the French Open by defeating former champion Ana Ivanovic in the semifinals.

She missed the Asian swing as a result and in her first match back in Linz, she lost to Andreea Mitu in straight sets.

[28] Martina Hingis and Sania Mirza began their partnership at the BNP Paribas Open and winning the title against Makarova/Vesnina, they then claimed their next two events at the Miami Open once again over Makarova/Vesnina and the Family Circle Cup over Dellacqua/Jurak, claiming three titles in a row, this wins placed Mirza on the top of the rankings.

[31] Bethanie Mattek-Sands and Lucie Šafářová began their pairing by winning their first doubles slam as a team and as individual at the Australian Open defeating Chan/Zheng.

The pair also reached the finals of Mixed Doubles slam but both losing with different partners Mladenovic with Daniel Nestor at the Australian Open and Babos with Alexander Peya at Wimbledon.

Hao-ching also claimed a title with Anabel Medina Garrigues at the Nürnberger Versicherungscup defeating Arruabarrena/Olaru, while Yung-jan paired with Zheng Jie in a losing effort at the Australian Open to Mattek-Sands/Šafářová.

On October 18, Raquel Kops-Jones and Abigail Spears qualified after reaching the final of the Generali Ladies Linz.

On October 20, following Makarova and Vesnina's withdrawal, the Czech pairing of Andrea Hlaváčková and Lucie Hradecká took their spot.

Hradecká also reached the final of Gastein Ladies with Lara Arruabarrena losing to Kovinić/Vogt, she won her lone title at the Connecticut Open with Julia Görges defeating Chuang/Liang.

On October 22, following the withdrawal of Dellacqua and Shvedova, the Spanish duo of Garbiñe Muguruza and Carla Suárez Navarro qualified for the championships.

Sharapova has a strong record against Radwańska, standing at 12–2, winning the last 5 meetings, most recently in first round of the 2015 Fed Cup.

In the final match up, Radwańska leads Pennetta 5–3, including victory over the Italian in their most recent encounter, at the 2015 Qatar Total Open.