China's Bu Yunchaokete converted just three of 17 break points, but it was enough to claim a 6-7 (2), 6-3, 7-6 (4) victory over Taiwan's Chun-Hsin Tseng in Winston-Salem Open first-round action on Sunday.

Yunchaokete's reward? A second-round matchup with top-seeded Stefanos Tsitsipas of Greece on Tuesday.

Mackenzie McDonald racked up 28 of his 58 winners in the third set to earn a 6-4, 6-7 (2), 7-6 (2) victory over Brandon Holt in a match that lasted two hours, 32 minutes.

The Netherlands' Botic van de Zandschulp shrugged off a first-set loss for a 2-6, 7-5, 6-3 victory over Australia's Adam Walton. Vit Kopriva of the Czech Republic pulled off a similar rally as he defeated Austria's Sebastian Ofner 3-6, 6-4, 6-3.

Serbia's Hamad Medjedovic and France's Arthur Rinderknech hooked up for

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