Playing in her first final at the elite Premier Mandatory level, World No.15 Elena Vesnina battled through a tense three hours and one minute to subdue eighth-ranked Svetlana Kuznetsova.
Serena Williams had little trouble in getting past Elene Vesnina in their semi-final clash, while her elder sister Venus Williams was sent packing in straight sets by Australian Open champion Angelique Kerber
Serena Williams needed just 48 minutes to overwhelm Elena Vesnina 6-2, 6-0 on Thursday in a semifinal that felt more like a training session.
Serena Williams, who is bidding for a record-equalling Open era 22nd Grand Slam title, will face Russian World No. 50 Elena Vesnina in the Wimbledon semi-finals
Wimbledon men's singles defending champion Novak Djokovic's third round exit against Sam Querrey surprised the tennis world.
Caroline Garcia and Kristina Mladenovic became the first French duo to win the French Open after 46 years as they defeated Ekaterina Makarova and Elena Vesnina to clinch the women's doubles title.
Sania Mirza and Martina Hingis lost 2-6, 6-4, 10-5 to Russian pair Elena Vesnina and Daria Kasatkina in the quarterfinals of the Qatar Open, bringing an end to their 41-match unbeaten streak.
Karolina Pliskova and Barbora Strycova beat Russia's Anastasia Pavlyuchenkova and Elena Vesnina 4-6, 6-3, 6-2 at Prague's hardcourt O2 Arena to hand Czech Republic their fourth trophy in five years.
Martina Hingis, 33, was playing with Italy's Flavia Pennetta but despite a promising start to the women's doubles final they went down 2-6, 6-3, 6-2 to fourth seeds Ekaterina Makarova and Elena Vesnina.
Russians Ekaterina Makarova and Elena Vesnina ended the surprising run of Japanese veteran Kimiko Date-Krumm and Czech partner Barbora Zahlavova Strycova 7-5, 6-3 and will take on Martina Hingis and Flavia Pennetta in the final.
Venus said that she needs time to rest after playing the first tournament of 2014 in Auckland.
Sania Mirza and Romanian Horia Tecau had joined forces this season for the Wimbledon championship, where they made quarter-finals and also played together at the US Open, making the third round.
Williams collected her 11th title of the year and became the first player to defend the title since Justine Henin in 2007.
Serena Williams, who claims to be exhausted near the end of a long season, reacted with fretful worrying, and sometimes distracting behaviour while struggling to a 6-4, 2-6, 6-4 two-hour win over Jelena Jankovic.
The world No.1 overcame physical difficulties, emotional distress as well as a stubborn opponent in Jelena Jankovic before reaching the final of the WTA Championships with a 6-4, 2-6, 6-4 win.
The fourth-seeded Li Na will play 2011 champion Petra Kvitova, who came from behind to beat Angelique Kerber 6-7 (3), 6-2, 6-3.
Serena Williams was relentlessly focussed against 2011 winner Petra Kvitova, hitting 27 winners and 11 immaculately delivered aces.
Li Na is already the first Chinese singles player to have won a Grand Slam title and to have reached the world's top five.