American teenage sensation Coco Gauff has set up a third-round showdown with defending champion Naomi Osaka at the US Open.
The 15-year-old survived a second-round thriller with Hungarian Timea Babos to win 6-2, 4-6, 6-4 at Louis Armstrong Stadium on Thursday night.
"This is just the beginning, I promise," Gauff told the crowd.
Meanwhile, unseeded American Taylor Townsend upset Wimbledon champion and No. 4 seed Simona Halep in the second round with a 2-6, 6-3, 7-6 (7-4) win.

Infantino accuses World Cup critics of spreading hate in open letter
Pogacar wins record-equalling fifth Tour de France title
Herbert storms to record-breaking LIV Golf UK victory
India’s prodigy Sooryavanshi leads the way in T20 series success
Norris wins Hungarian Grand Prix for McLaren
