American saves three set points in second-set rally
Gauff wins six straight games to seal 6-4, 7-5 victory
World No 4 needs Noskova help to reach last four
Coco Gauff clawed out a 6-4, 7-5 round-robin victory over Marta Kostyuk on Thursday to keep her WTA Finals hopes alive in Indian Wells, California.
The world No 4 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 Thursday’s final group match, Pegula will advance instead. Noskova has already qualified.