Seventh seed Aryna Sabalenka beat third seed Jessica Pegula 6-3 7-5 in a thrilling upset at the WTA Finals in Fort Worth on Friday night.
The win for Sabalenka means the 24-year-old remains in contention - along with second seed Ons Jabeur - for the last qualifying spot in the Nancy Richey Group.
Sabalenka will have to wait to find out if Maria Sakkari can win a set when she locks horns with Jabeur on Friday night.
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If the Greek manages it, she will win the group, while Sabalenka will advance in second place, but if the Tunisian wins in straight sets, then Sabalenka will miss out.
Despite a nervous wait, Sabalenka is still pleased with the way she jousted her superior on the night.
“I definitely was happy with my serve – for the [first] half of the match,” Sabalenka said in her on-court interview after the match.
“I’m just happy that I was really focused from the beginning to the end and I was able to finish this match in two sets.”
Sabalenka enjoyed a double break, in the first and seventh games of the opening set, as she took the lead.
With a 5-3 lead and serving for the second set, Pegula managed a break before she drew level to hang on at 5-5.
Sabalenka replied with a break to take the set to a tie-break, and a double fault, an unforced backhand error and a huge backhand cross-court winner closed it out.
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