Nick Kyrgios has landed a second ATP title, defeating American John Isner in straight sets to win the Atlanta Open.

Kyrgios, who made himself available for the tournament after withdrawing from the Australian Olympic campaign earlier this year, triumphed 7-6 (7-3) 7-6 (7-4) on Sunday to take down the big-serving top seed.

The victory provisionally bumps the feisty 21-year-old up to a career-high ranking of 16, and will give him a crucial top-16 seeding at the US Open later this month.