Williams won her three round robin matches in straight sets, spending just three hours and thirty eight minutes on court, while Jankovic played for five hours and one minute in her straight sets win over Vika Azarenka, two hours eleven minutes in her three set loss to Na Li and one hour forty one minutes in her victory over Sara Errani. Williams led the head to head over the Serb former number one 7-4, but had won the last three matches dating from 2012, but the Serb had the honour of taking a love set off Williams in Charleston this year.
Jankovic started proceedings and led 2-1 when the third game seemed to go on forever, with deuce and advantage going from one side of the net to the other until the Serb eventually strung two points together to break and go 3-1 ahead. Serena got back one break to trail 2-3 and then another with a hold to lead 4-3 and then 5-3. Jankovic held to trail 4-5 and then yet another very long game ensued in the 10th game with Serena serving for the set and she finally managed to scrape the game and with it the set at 6-4.
The Serbian began the second set and first three games went with serve until Jankovic broke away to lead 4-1. The American got another game before Jelena went 5-2 up with Williams serving to stay in the set, but Jankovic pulled out another break to take the set 6-2.
After both players exchanged one break each at the start of the decider, it was Williams who managed to regroup and race to a 5-1 lead. Despite Jankovic reducing the score to 4-5, Serena held nerve, serving out the match and booking a place in the Sunday final.