DELRAY BEACH, Fla. — American wild card Frances Tiafoe saved 14 of 16 break-point chances to edge No. 2-seeded Juan Martin del Potro 7-6 (6), 4-6, 7-5 Thursday night in the second round of the Delray Beach Open.

Tiafoe hit 17 aces and won a three-setter for the fourth time this month.

No. 8 Chung Hyeon became the highest-seeded player to reach the quarterfinals when he eliminated Franko Skugor 6-4, 7-6 (4). Denis Shapovalov, an 18-year-old Canadian, beat American Jared Donaldson 6-7 (6), 6-4, 6-4.

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