Ons Jabeur came from a set down to beat American Jessica Pegula 1-6, 6-2, 6-3 in Chicago.
The Tunisian saved two break points to win the match in 94 minutes, but it wasn’t without drama.
“I’m very happy. It was kind of the same scenario of what happened in Montreal,” Jabaeur said, referring to their match-up in August when roles were reversed.
“I had three match points, but I know Jess plays really good and you have to earn every game, every point with her, and I’m glad I got this win this time.
“I started really slow. Starting the match, I think I was a little bit sleepy. I started to move my legs better, I started to put more balls in. After, it was really tight between us.”
The Tunisian will meet top seed Elina Svitolina in the quarter-finals.
Meanwhile, No.5 seed Elena Rybakina picked up a third career win against Veronika Kudermetova 7-6(4), 7-5 in an all-Russian match-up.
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