Coco Gauff showed her mettle to overcome former world no.1 Naomi Osaka to reach the San Jose quarter-finals, winning 6-4 6-4 at the WTA 500 event.
After an edgy start and being 2-1 down, Gauff went on a blistering run to win 10 of the next 13 games and win the first set 6-4, before going into a 5-1 lead in the second.
Ad/> Osaka showed her class though, and was able to recover from seven match points, but Gauff ultimately prevailed on the eighth to win the match after an hour and two minutes of play.
WTA Washington'I want to see what she's going to bring' — Osaka relishing facing 'mature' GauffA DAY AGO The defeat raises more questions about four-time Grand Slam champion Osaka, who has struggled to maintain a degree of consistency while on the WTA tour.