The Canadian’s 2-6, 6-3, 7-6 (2) victory over the No. 4-ranked American was his biggest win by ranking since 2022.

It’s quarterfinal day at the ATP Dallas Open. The tournament delivered three massive upsets on Thursday with the exits of Ben Shelton, Frances Tiafoe, and the top seed Taylor Fritz.

Matteo Arnaldi (No. 39 in the world) takes on Jaume Munar (No. 64) in the quarterfinals at the Dallas Open.Arnaldi heads into ...