American young gun Ben Shelton battled past Tommy Paul in four sets at the US Open as temperatures nudged towards 38C.

Shelton, 20, won 6-4 6-3 4-6 6-4 to become the first man through to the quarter-finals as the action heated up alongside the temperatures.

With five Americans playing in eight matches on the two steamy show courts, the home fans had plenty to cheer as the US men continued their push to end a 20-year U.S. Open title drought.

In a rematch of their Australian Open quarter-final, Shelton avenged his four-set loss in Melbourne.

Paul was out smartly to a 3-0 lead but it was all downhill from there as the big-hitting Shelton blasted away, hammering down two 149mph serves, the fastest seen at Flushing Meadows this fortnight.

Paul recovered from 4-1 down in the third set to take it 6-4 but Shelton held steady, breaking his compatriot to take the fourth set 6-4 and seal the win.

—AAP

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