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

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,

Fourth-seeded Ben Shelton beat second-seeded Taylor Fritz 6-4, 6-3 in an all-American semifinal match Wednesday night in the National Bank Open Open.