Aug 7 (Reuters) - American fourth seed Ben Shelton battled from a set down to clinch his first ATP Masters 1000 title at the Canadian Open in Toronto on Thursday, defeating Russian 11th seed Karen Khachanov 6-7 (5) 6-4 7-6 (3).

Karen Khachanov lost to Ben Shelton in the Canadian Open final on Thursday, as the American won his first ATP 1000 title and secured a record $1,124,380 prize.

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.