Sixth time unlucky, it's back to the drawing board for a devastated Alex de Minaur at the US Open after he blew surely his best chance yet to reach a grand slam semi-final.

With his serving once again letting him down badly, Australia's No.1 was still left reflecting on golden opportunities missed as he went down 4-6 7-6 (9-7) 7-5 7-6 (7-4) to Felix Auger-Aliassime in a curiously uneven and largely flat quarter-final marathon at Flushing Meadows on Wednesday.

After five previous last-eight disappointments while searching for that elusive breakthrough, de Minaur was a set up, then a break up before missing out on a set point in the second, and still looking the better player in the latter stages of the third as he rallied impressively.

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