Defending champion Sam Querrey has reached the Delray Beach Open quarterfinals by hitting 13 aces and winning 24 of 25 first-serve points in a 6-2 6-3 victory over Jared Donaldson.
Querrey, ranked 35th and seeded No.4, saved both break points he faced and took exactly an hour to beat his 20-year-old opponent.
Querrey next will face the winner of the match on Thursday night between 2009 US Open champion Juan Martin del Potro, who is seeded No. 7, and 79th-ranked Damir Dzumhur.
In other action, Donald Young followed up his upset of No.2 seed Ivo Karlovic by coming back to eliminate 19-year-old Taylor Fritz 4-6 6-3 6-4.
Young, ranked 69th, had his left knee checked by a trainer after only five games and wound up dropping that set.
But Young managed to turn the match around despite finishing with 12 double-faults and facing 15 break points.
In the quarterfinals, Young meets Belgium’s Steve Darcis, a 6-3 7-5 winner against Nikoloz Basilashvili.
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