Coco Gauff clawed out a 6-4, 7-5 round-robin victory over Marta Kostyuk on Thursday to stay alive in the WTA Finals in Indian Wells, California.
World number four Gauff still needs help to reach the semi-finals of the elite season-ending event.
If fifth-ranked compatriot Jessica Pegula beats Wimbledon champion Linda Noskova in the last group one match later Thursday Pegula will go through instead. Noskova has already advanced.
But Gauff did what she could with a gutsy straight-sets win. Trailing 5-1 in the second set she saved three set points in the seventh game to launch a run of six straight games to seize the match.
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The first set had also been a battle. Broken in the opening game, Gauff appeared to have seized control when she broke Kostyuk for a second time for a 4-2 lead then held for 5-2.
Kostyuk looked demoralized as she took a medical timeout for treatment on her right wrist.
But after having the wrist taped she came back to hold serve then broke Gauff as the American served for the set -- Gauff helping her out with a pair of double faults.
