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.

Banton blitz lifts England past Scotland in T20 World Cup
Tudor appointed as interim Tottenham manager until end of season
Eight teams qualify for Dubai Games finals
Shaidorov shocks rivals to capture gold as 'Quad God' Malinin crumbles
Sabalenka, Swiatek withdraw from Dubai Duty Free Tennis Championships
