Serbia’s Janko Tipsarevic advanced into the quarterfinals of the Mercedes Cup in Stuttgart after overpowering Steve Darcis of Belgium 6-4  6-2.

Tipsarevic, who received a bye into the second round, will face German Bjorn Phau next.

Phau ended Lukas Rosol’s run as he eliminated him in two tiebreaks, winning 7-6 (3)  7-6 (2). The Czech dropped to 103 in the rankings, despite defeating Spaniard Nadal a couple of weeks ago at the Wimbledon Championships.

From the other second round matches: Spaniard Guillermo Garcia-Lopez dismissed fellow Pablo Andujar 6-1  4-6  6-1 and German wild card holder Dustin Brown booked his place in the last 8 after overcoming Benoit Paire of France 7-6 (4)  4-6  6-1.