Dmitry Tursunov saw his run at the Indianapolis Tennis Championships halted at the quarter-final stage by Frank Dancevic.

The top seed had been aiming to reach his third successive final at the tournament, which he won in 2007 at the expense of Dancevic, and things looked promising when the Russian took the opening set.

But Dancevic hit back to claim a 3-6 7-6 (7/5) 6-2 victory, his first win over Tursunov in four career meetings.

The Canadian will now face third seed Sam Querrey in the last four. The American overcame seventh-seeded Frenchman Marc Giquel 6-4 7-5.

Qualifier Alex Bogomolov Jr saw his challenge ended by American compatriot Robby Ginepri, who recorded a 7-5 6-1 victory.

John Isner completed the semi-final line-up with his hard-fought 7-5 6-7 (2/7) 7-5 win over Wayne Odesnik.