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

Ben Shelton came back for a 6-7 (5), 6-4, 7-6 (3) victory over Karen Khachanov on Thursday night in the men's singles final at the National Bank Open. It was the American's first ATP Tour title of the season and third of his career.

In an exhilarating Canadian Open, a new name will be etched onto the trophy as Ben Shelton and Karen Khachanov eye up Toronto glory, as they prepare to battle it out for a prestigious Masters 1000 title.