Alex Michelsen of the United States reached the quarterfinals of the men’s National Bank Open in Toronto with a straight sets win over countryman Learner Tien.

Alex Michelsen of the United States upset third-seeded Lorenzo Musetti of Italy 3-6, 7-6 (4), 6-4 on Thursday in the third round of the National Bank Open.

Alex Michelsen pulled off a comeback for a notable upset in the third round of the National Bank Open at Toronto on Thursday, but getting to the finish was no easy feat.