The unseeded Fish upended 32nd-seeded Frenchman Gael Monfils 7-5, 6-2, 6-2 on Labor Day at the USTA Billie Jean King National Tennis Center. Fish will appear in only his second-ever major quarterfinal, with his other one coming in Melbourne last year.

Fish advanced in just under two hours on Day 8, as he broke Monfils' serve no less than six times, compared to only one break for the loser from France.

Monfils, who turned 22 here on Monday, was a surprise French Open semifinalist back in June.

Fish, a runner-up in New Haven two weeks ago, will meet the Rafael Nadal-Sam Querrey winner in the quarters. Fish ousted great friend and fellow American James Blake, the ninth seed here, in the third round last week.