Kyrgios ends Isner reign in Atlanta

Top seed Isner had won each of the last three instalments of the ATP World Tour 250 event but went down 7-6 (7-3) 7-6 (7-4) to the second seed.

Nick Kyrgios

Australian tennis player Nick Kyrgios about to serve.

Nick Kyrgios beat John Isner in straight sets at the Atlanta Open on Sunday to end the American's three-year grip on the title.

Top seed Isner had won each of the last three instalments of the ATP World Tour 250 event but went down 7-6 (7-3) 7-6 (7-4) to the second seed.

Isner put early pressure on Kyrgios with three break points in the Australian's first service game, but that was the closest either player came to sealing a break.

The 21-year-old, whose only other professional title came earlier this year in Marseille, held his nerve in stifling temperatures to take the first tie-break 7-3.