TORONTO - Alex Michelsen of the United States has reached the quarterfinals of the National Bank Open with a straight sets victory over Learner Tien.

The No. 26 seed swept his countryman 6-3, 6-3 in the round of 16 at the ATP Masters 1000 tennis tournament Saturday. 

Michelsen continued to roll at the Canadian men's national championship after ousting the third-seeded Lorenzo Musetti of Italy earlier in the week. 

No. 11 seed Karen Khachanov of Russia is also into the quarters after topping No. 8 Casper Ruud of Norway 6-4, 7-5 at Sobeys Stadium.

Defending champion and No. 18 seed Alexei Popyrin of Australia took on No. 5 Holger Rune of Denmark later Saturday, while Germany's Alexander Zverev, the No. 1 seed, faced No. 14 Francisco Cerundolo of Argentina in the late match.

Canadian wild cards Cleeve Harper of Calgary and Liam Draxl of Newmarket, Ont. — the last Canadians standing in Toronto after a disappointing singles showing — were ousted 7-5, 7-6 (3) by Guido Andreozzi of Argentina and Sander Arends of the Netherlands in second-round doubles play.

Top-ranked Jannik Sinner of Italy, No. 2 Carlos Alcaraz of Spain, No. 5 Jack Draper of Britain and No. 6 Novak Djokovic of Serbia all skipped the US$9.19-million hardcourt event expanded to a 96-player field in 2025.

The tournament runs through Thursday.

This report by The Canadian Press was first published Aug. 2, 2025.