Canadian Gabriel Diallo bows out of U.S. Open following 4-set loss to American Paul

Gabriel Diallo's run at the U.S. Open is over.

The 22-year-old from Montreal lost 6-7 (5), 6-3, 6-1, 7-6 (3)to No. 14 seed Tommy Paul of the United States in the third round of the Grand Slam tennis tournament.

Diallo, ranked 143rd in the world entering the tournament, qualified for only his second main draw at a major.

He upset No. 24 seed Arthur Fils of France in the second round and world No. 84 Jaume Munar of Spain in the main-draw opener.

In women's doubles, defending U.S. Open champions Gabriela Dabrowski of Ottawa and Erin Routliffe of New Zealand advanced to the third round.

The No. 1 seeds defeated American Catherine Harrison and Poland's Alicja Rosolska 7-5, 6-4, winning the match in 96 minutes.

WATCH | Diallo falls to Paul: 

Jannik Sinner never gave his third-round opponent, Chris O'Connell, even a moment to contemplate pulling off the sort of monumental upsets that eliminated Novak Djokovic and Carlos Alcaraz.

The No. 1-ranked Sinner, suddenly the favorite to win the men's championship at Flushing Meadows next weekend, won the first five games and 21 of the first 29 points to make quite clear how things would go at Arthur Ashe Stadium and wrapped up a 6-1, 6-4, 6-2 victory over O'Connell in under two hours.

"I felt like he was on from the get-go," O'Connell said. "I felt a little bit clueless, to be honest. ... Every single shot, I just felt like I had to do something with it, because he was just on me. He was suffocating me."

Stepping on court less than 15 hours after Djokovic's loss to Alexei Popyrin, and two days after Alcaraz's loss to Botic van de Zandschulp, Sinner was as dominant as can be in every facet of the sport. With 23-time major champion Serena Williams watching from an Ashe suite, Sinner