Felix Auger-Aliassime staged a New York fightback to beat Alex De Minaur and reach his second US Open semi-final.
De Minaur was bidding to make the last four at a grand slam for the first time at the sixth attempt and he led by a set and a break at Flushing Meadows.
But Auger-Aliassime, who knocked out third seed Alexander Zverev in the third round, responded impressively, battling to a 4-6 7-6 (7) 7-5 7-6 (4) victory in four hours and 10 minutes.
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