American Taylor Fritz, the top seed, reached the quarter-finals of the Delray Beach Open by beating Chinese Yunchaokete Bu 7-6 (4), 6-2 at the Delray Beach Stadium and Tennis Center.
Fritz, ranked No 4, will face Spaniard Alejandro Davidovich Fokina, the No 8 seed, next.
In the previous round of the Delray Beach tournament, Bu, ranked No 69, won against Australian Rinky Hijikata (6-2, 6-0).
Delray Beach ATP 250, other second-round results (Delray Beach Stadium and Tennis Center, hard, USD 680.140, most recent results first):
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