Ben Shelton won his first ATP Masters 1000 title Thursday night at the National Bank Open in Toronto and served notice to the tennis world ahead of the U.S. Open.

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.

American fourth seed Ben Shelton battled from a set down to clinch his first ATP Masters 1000 title at the Canadian Open on Thursday, defeating Karen Khachanov of Russia 6-7(5) 6-4 7-6(3). The world number seven capped off an impressive week that saw him beat Italian 13th seed Flavio Cobolli,