INDIAN WELLS, Calif. (AP) — Coco Gauff rallied to win the final six games of the match and beat Marta Kostyuk 6-4, 7-5 in her round-robin group at the WTA Finals on Thursday.

Then came more suspense.

Gauff's eventual fate depended on the outcome of fellow American Jessica Pegula's match against Wimbledon champion Linda Noskova later. A victory by Pegula would knock Gauff, her former doubles partner, out and advance Pegula to the semifinals of the season-ending championships. Gauff beat Pegula in three sets in their opening Group 1 match.

Noskova had already advanced to the semifinals at the $10 million event in the Southern California desert, which was moved from Saudi Arabia because of the Iran war in the Middle East.

Gauff overcame serving issues and visits from a trainer during the match.

Kostyuk raced to a 4-0 lead in in the second set, fighting off four break points to hold in the second game. Twice, Gauff double-faulted away games. She requested a trainer early in the set to work on her as she lay on her side while Kostyuk walked over to sit on the advertising board and chat with her team.

Kostyuk led 5-1 before Gauff's comeback began. She overcame three break points and hit a crosscourt forehand winner to trail 5-2. Gauff broke twice to tie the set at 5-5. Gauff held for a 6-5 lead and won the match on Kostyuk's netted forehand.

Gauff led 5-2 in the first set before Kostyuk broke to close to 5-4. Gauff broke back in the next game with a gutsy crosscourt backhand volley winner to take the set.

Kostyuk got into the Finals as the first alternate after top-ranked Elena Rybakina withdrew because of a viral illness. The 24-year-old Ukrainian went 0-3 in Group 1 play.

___

See AP’s full tennis coverage here