The 22-year-old Shelton, seeded fourth, became the first American winner in the Masters 1000 hard-court event since Andy Roddick in 2003.

With the match on the line late in the decisive third set, Ben Shelton went with what got him to the National Bank Open final.

Ben Shelton became the first American to win an ATP Masters 1000 title in Canada in more than two decades as he defeated Karen Khachanov 6-7 (5/7), 6-4, 7-6 (7/3) in Toronto final on Thursday.