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.

Karen Khachanov rallied to defeat top seed Alexander Zverev and book an ATP Toronto Masters title clash with Ben Shelton, who beat second seeded Taylor Fritz on Wednesday.Shelton, seeded fourth, hammered Fritz 6-4,