With a straight-set victory against fellow countrywoman CoCo Vandeweghe, American Jessica Pegula qualified for the San Diego Open quarterfinals and the WTA Finals in Fort Worth.

The No. 4 seed Jessica Pegula upset fellow American CoCo Vandeweghe 6-3, 6-1 to end the night’s play under the lights, and 2022 Australian Open finalist Danielle Collins overcame Martina Trevisan of Italy 6-2, 6-4 to go to the round of eight.

Pegula defeated her former Top-10-ranked compatriot in her opening match of the week in just 69 minutes, winning 12 of the final 14 games after falling early on (2-0).

She also created personal history, as Pegula’s qualifying for the singles field of the WTA Finals in Fort Worth, Texas, which starts on October 31, was secured with the victory.

The U.S. No. 1 Pegula used the victory as a form of retaliation after losing to Vandeweghe in three sets in their only previous encounter in Charleston earlier this year. Pegula said that she had a straightforward strategy for the rematch.

“It’s quite challenging when she’s on with her serve and returns. Whenever I had the chance, I tried to attack and apply pressure on her serve “After winning, Pegula was reported as saying.