[1] The field will consist of the top four pairs of players not already qualified for the 2015 WTA Finals, plus two wild cards.

She won her biggest title since Dubai 2010, by claiming the Wuhan Open defeating Garbiñe Muguruza in the finals.

The first coming at the Diamond Games, where she needed to withdraw from the final against Andrea Petkovic with a neck injury.

She reached her biggest final to date at the Dubai Tennis Championships but fell to Simona Halep in two tight sets.

She took her lone title of 2015 at her home tournament at the Prague Open defeating compatriot Lucie Hradecká in three sets.

Roberta Vinci had a slow start to the year only winning back-to-back matches twice until she reached the final of Nürnberger Versicherungscup losing to compatriot Karin Knapp in three sets.

She reached the quarterfinals of Rogers Cup and followed it up with the biggest upset of the year when she ended Serena Williams dreams of a Grand Slam in New York in the semifinal.

Caroline Wozniacki began the year by the reaching the final of ASB Classic but lost to Venus Williams.

She reached her third final of the year at the Porsche Tennis Grand Prix losing in three sets to Angelique Kerber.

At the French Open, Errani was able to reach the quarterfinals for the fourth straight year losing to Serena Williams.

She reached her second final of the year at the BRD Bucharest Open, once again facing Anna Karolína Schmiedlová but this time losing.

Svitolina won the third title of her career at the Grand Prix SAR La Princesse Lalla Meryem defeating Tímea Babos in the final.

At the Western & Southern Open, Svitolina reached the semifinals by defeating Lucie Šafářová before losing to Serena Williams.

Her season was highlighted by a win of the WTA 125k title in Dalian and a semifinal performance in Shenzhen as well as quarterfinal showings at Tokyo and Guangzhou.

Klaudia Jans-Ignacik and Andreja Klepač lost in the round of 16 in their first two tournaments in Sydney and Hobart together to Ana Ivanovic and Angelique Kerber and Kiki Bertens and Johanna Larsson respectively.

They then reached the semifinals in Indian Wells, upsetting fourth seed Hsieh Su-wei and Flavia Pennetta, defeating Svetlana Kuznetsova and Coco Vandeweghe, Sabine Lisicki and Andrea Petkovic along the way before losing to second seed Ekaterina Makarova and Elena Vesnina in straight sets.

They beat Kiki Bertens and Tatjana Maria to reach the round of 16 in Miami before losing to ninth seed Andrea Hlaváčková and Lucie Hradecká in straight sets.

They then suffered a five-week drought without a win, losing their first match in Rome, French Open, Eastbourne, Wimbledon to fifth seed Bethanie Mattek-Sands and Lucie Šafářová, Janette Husárová and Paula Kania, fourth seed Caroline Garcia and Katarina Srebotnik, Kimiko Date-Krumm and Francesca Schiavone respectively.

Anabel Medina Garrigues / Arantxa Parra Santonja Gabriela Dabrowski / Alicja Rosolska Liang Chen / Wang Yafan Lyudmyla Kichenok / Nadiia Kichenok Xu Shilin / You Xiaodi Below are the head-to-head records as they approached the tournament.