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 apologised to Karen Khachanov after beating him in the Canadian Open final on Sunday night. The American softened the blow of Khachanov's defeat by sharing heartfelt words about the Russian and his team following a hard-fought match in Toronto.

Ben Shelton beat Taylor Fritz 6-4, 6-3 in an all-American semifinal match Wednesday night in the National Bank Open. Shelton will face 11th-seeded Karen Khachanov of Russia.