20-year-old fires down 149mph serves in four-set victoryTiafoe rolls past wildcard Rinky Hijikata 6-4, 6-1, 6-4
Ben Shelton powered past his fellow American, Tommy Paul, to reach the US Open quarter-finals where he will face another countryman in Frances Tiafoe.
Shelton, a big-serving 20-year-old from Atlanta, fired down a pair of 149mph serves in one game on his way to a 6-4, 6-3, 4-6, 6-4 victory at Flushing Meadows. The world No 47 also gained revenge on Paul for his win when the players met at the same stage of the Australian Open in January.
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