Marseille - Michael Llodra of France stunned sixth-seeded Alexandr Dolgopolov of Ukraine 6-4, 5-7, 7-6 (7/5) on Thursday to reach the quarter-finals of the Open 13.
Llodra hit 19 aces, and the 2010 champion won four straight points to take a 5-2 lead in the deciding tie-breaker.
Richard Gasquet also advanced by cruising past Igor Kunitsyn of Russia 6-3, 6-2.
The fifth-seeded Frenchman broke Kunitsyn's serve three times and saved all six break points he faced.
Gasquet has now reached the quarter-finals four times this season.
Results on Thursday from the Open 13, an ATP tournament on indoor hard courts at Palais des Sports (seedings in parentheses):
Richard Gasquet (5), France, def. Igor Kunitsyn, Russia, 6-3, 6-2.
Michael Llodra, France, def. Alexandr Dolgopolov (6), Ukraine, 6-4, 5-7, 7-6 (7/5).
Juan Martin Del Potro (4), Argentina, def. Nikolay Davydenko, Russia, 6-7 (6/8), 6-4, retired.