Coco Gauff, who was also born in Atlanta, cruised into the third round with a 6-3, 6-2 victory over 16-year-old Russian Mirra Andreeva.
The sixth-seeded Gauff approached the net 18 times, winning 15 of those points, and she credited that newfound net game after struggling to beat German Laura Siegemund in three sets in the first round.
“I learned to be aggressive,” the 19-year-old Gauff said in her on-court interview. “I did well making her play off her back foot.”
Gauff next faces 32nd-seeded Elise Mertens, who came back to beat American Danielle Collins 3-6, 7-6 (9), 6-1.
In the biggest upset of the day, seventh-seeded Stefanos Tsitsipas fell in the second round to 128th-ranked Swiss qualifier Dominic Stricker 7-5, 6-7 (2), 6-7 (5) 7-6 (6), 6-3.
John Isner vs. Michael Mmoh, 11 a.m.
Where/when to watch on TV
Noon, ESPN and 6 p.m. on ESPN2