Fourth-seeded Ben Shelton rallied for the biggest championship of his career, recording a 6-7 (5), 6-4, 7-6 (3) win over 11th-seeded Karen Khachanov in the final of the National Bank Open on Thursday in Toronto.

Shelton, 22, earned his first ATP Masters 1000 title while becoming the youngest U.S. player to win a Masters 1000 event since Andy Roddick was the champion at Miami in 2004.

"It's a surreal feeling," Shelton said. "It's been a long week, not an easy path to the final. My best tennis came out when it mattered most. I was clutch, I persevered, I was resilient. All the qualities I like to see in myself."

After squandering three set points just before losing the first tiebreaker, Shelton got the only service break of the second set for a 5-4 lead. Khachanov had four break points in

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