Caroline Wozniacki
Wozniacki began the year as the world no.
1; she lost her top ranking after the Australian Open after losing in the quarterfinals to Kim Clijsters 3-6, 6-7.
She did not reach a final until the e-Boks Open, where she was the two-time defending champion but lost to Angelique Kerber 4–6, 4–6.
At the French Open, she lost to Kaia Kanepi 1-6, 7-6, 3-6.
At Wimbledon, she was upset by Tamira Paszek 7-5, 6-7, 4-6 in the first round.
At the US Open, after reaching the semifinals the previous year, she lost in the first round 2-6, 2-6, which dropped her ranking out of the top 10 for the first time since 2009.
She won her first title of the year at KDB Korea Open, defeating Kaia Kanepi 6-1, 6-0.
A few weeks later, she continued her good form and won the title at Kremlin Cup, claiming victory over Samantha Stosur 6–2, 4–6, 7–5, coming back from 1–4 in the final set.
She is making her debut to the event.

Nadia Petrova

Petrova was competing for the second time, having reached the semifinals the previous year.
She qualified for the event by winning the UNICEF Open, her first grass title defeating Urszula Radwańska 6-4, 6-3 in the final.
She won her second title of the year at the Toray Pan Pacific Open, her first Premier 5 title since its inception, defeating defending champion Agnieszka Radwańska 6–0, 1–6, 6–3.
At the slams, she reached the second round of the Australian Open, losing to Sara Errani 2-6, 2-6.
She then lost in the third rounds of Wimbledon to Samantha Stosur 3-6, 3-6 and French Open to Camila Giorgi 3-6, 6-7.
At the US Open, she reached the fourth round, falling to Maria Sharapova 1-6, 6-4, 4-6.
She had huge top ten wins over Samantha Stosur and Sara Errani.

Maria Kirilenko

Kirilenko was one of the two wild card recipients in the event.
Kirilenko did not win a title in the year.
However, she was able to reach two finals in the year the first of which was in the Pattaya City, losing to Daniela Hantuchová 7-6, 3-6, 3-6.
She reached her second final at the New Haven Open at Yale losing to Petra Kvitová 6-7, 5-7, despite leading 5-2 in the second set.
She was able to reach the quarterfinals of Wimbledon losing to Agnieszka Radwańska 5-7, 6-4, 5-7 in a rain delayed match.
At the Olympics she ended 4th place losing the Bronze Medal Match to Victoria Azarenka 3-6, 4-6.
At the other slams, she lost in the third rounds of the Australian Open retiring against Kvitová 0-6, 0-1 and of the US Open losing to Andrea Hlaváčková 7-5, 4-6, 4-6.
She also reached the second round of the French Open losing to Klára Zakopalová 4-6, 6-3, 3-6.
Her biggest win came in the quarterfinals of the Olympics over Kvitová.

Roberta Vinci

Vinci is participating for the second time after 2011.
She qualified to the event by winning the Texas Tennis Open defeating Jelena Janković 7-5, 6-3 in the final and without dropping a set in the tournament.
She then reached her first slam quarterfinal at the US Open after defeating world no.
2Agnieszka Radwańska 6-1, 6-4 before losing to doubles partner Sara Errani 2-6, 4-6.
In the other slams, she lost in the second round of the Australian Open to Zheng Jie 4-6, 2-6, first round of the French Open losing to Sofia Arvidsson 2-6, 6-4, 3-6, and the fourth round of Wimbledon losing to Tamira Paszek 2-6, 2-6.
She earned another top ten win over world no.
7 Angelique Kerber 6-2, 7-6.

Hsieh Su-wei

Hsieh is having a breakthrough season, she started out of the top 100.
She won her first ever WTA Tour singles title in the Malaysian Open as a qualifier over Petra Martić after Martić retired when Hsieh was leading 2-6 7-5 4-1 due to fatigue from playing 3 hours earlier in the day.
This made her eligible to qualify for the event She also won the Guangzhou International Women's Open defeating Britain's Laura Robson 6-3, 5-7, 6-4, after coming back from 0-3 in the deciding set.
She also won 3 ITF titles in the year.
In the slams, she lost in the first rounds of the French Open to Flavia Pennetta 7-6, 4-6, 2-6, and of the US Open to Magdaléna Rybáriková 3-6, 6-2, 3-6, she also advanced to the third round of Wi
Caroline Wozniacki
Wozniacki began the year as the world no. 1; she lost her top ranking after the Australian Open after losing in the quarterfinals to Kim Clijsters 3-6, 6-7. She did not reach a final until the e-Boks Open, where she was the two-time defending champion but lost to Angelique Kerber 4–6, 4–6. At the French Open, she lost to Kaia Kanepi 1-6, 7-6, 3-6. At Wimbledon, she was upset by Tamira Paszek 7-5, 6-7, 4-6 in the first round. At the US Open, after reaching the semifinals the previous year, she lost in the first round 2-6, 2-6, which dropped her ranking out of the top 10 for the first time since 2009. She won her first title of the year at KDB Korea Open, defeating Kaia Kanepi 6-1, 6-0. A few weeks later, she continued her good form and won the title at Kremlin Cup, claiming victory over Samantha Stosur 6–2, 4–6, 7–5, coming back from 1–4 in the final set. She is making her debut to the event.
Nadia Petrova

Petrova was competing for the second time, having reached the semifinals the previous year. She qualified for the event by winning the UNICEF Open, her first grass title defeating Urszula Radwańska 6-4, 6-3 in the final. She won her second title of the year at the Toray Pan Pacific Open, her first Premier 5 title since its inception, defeating defending champion Agnieszka Radwańska 6–0, 1–6, 6–3. At the slams, she reached the second round of the Australian Open, losing to Sara Errani 2-6, 2-6. She then lost in the third rounds of Wimbledon to Samantha Stosur 3-6, 3-6 and French Open to Camila Giorgi 3-6, 6-7. At the US Open, she reached the fourth round, falling to Maria Sharapova 1-6, 6-4, 4-6. She had huge top ten wins over Samantha Stosur and Sara Errani.
Maria Kirilenko

Kirilenko was one of the two wild card recipients in the event. Kirilenko did not win a title in the year. However, she was able to reach two finals in the year the first of which was in the Pattaya City, losing to Daniela Hantuchová 7-6, 3-6, 3-6. She reached her second final at the New Haven Open at Yale losing to Petra Kvitová 6-7, 5-7, despite leading 5-2 in the second set. She was able to reach the quarterfinals of Wimbledon losing to Agnieszka Radwańska 5-7, 6-4, 5-7 in a rain delayed match. At the Olympics she ended 4th place losing the Bronze Medal Match to Victoria Azarenka 3-6, 4-6. At the other slams, she lost in the third rounds of the Australian Open retiring against Kvitová 0-6, 0-1 and of the US Open losing to Andrea Hlaváčková 7-5, 4-6, 4-6. She also reached the second round of the French Open losing to Klára Zakopalová 4-6, 6-3, 3-6. Her biggest win came in the quarterfinals of the Olympics over Kvitová.
Roberta Vinci

Vinci is participating for the second time after 2011. She qualified to the event by winning the Texas Tennis Open defeating Jelena Janković 7-5, 6-3 in the final and without dropping a set in the tournament. She then reached her first slam quarterfinal at the US Open after defeating world no. 2Agnieszka Radwańska 6-1, 6-4 before losing to doubles partner Sara Errani 2-6, 4-6. In the other slams, she lost in the second round of the Australian Open to Zheng Jie 4-6, 2-6, first round of the French Open losing to Sofia Arvidsson 2-6, 6-4, 3-6, and the fourth round of Wimbledon losing to Tamira Paszek 2-6, 2-6. She earned another top ten win over world no. 7 Angelique Kerber 6-2, 7-6.
Hsieh Su-wei

Hsieh is having a breakthrough season, she started out of the top 100. She won her first ever WTA Tour singles title in the Malaysian Open as a qualifier over Petra Martić after Martić retired when Hsieh was leading 2-6 7-5 4-1 due to fatigue from playing 3 hours earlier in the day. This made her eligible to qualify for the event She also won the Guangzhou International Women's Open defeating Britain's Laura Robson 6-3, 5-7, 6-4, after coming back from 0-3 in the deciding set. She also won 3 ITF titles in the year. In the slams, she lost in the first rounds of the French Open to Flavia Pennetta 7-6, 4-6, 2-6, and of the US Open to Magdaléna Rybáriková 3-6, 6-2, 3-6, she also advanced to the third round of Wi
2012 Qatar Airways Tournament of Champions