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.

Brook's defiant ton in vain as New Zealand beat England
Bencic tames Noskova to win Tokyo title
We need to find answers to stop Liverpool slide, says Slot
Rohit and Kohli bid likely farewell to Australia as winners
