Stan Wawrinka had to come from behind to get the better of Dustin Brown in the Moselle Open second round, eventually winning 4-6 6-3 7-6 (7-4).
The top seed slipped behind midway through the first set and squandered three opportunities to break back in the next game.
An early break in the second proved to be enough for Wawrinka to restore parity and set up a decider that went down to the wire.
Brown survived seven break points as the final set went to a tie-breaker, with the German edging in front.
However, Wawrinka clawed his way back with two breaks of serve to set up a quarter-final clash with Philipp Kohlschreiber – a 6-3 6-3 victor over Paolo Lorenzi.
The day’s only upset came in the all-French clash between Nicolas Mahut and seventh seed Adrian Mannarino, with the former prevailing 6-4 6-7 (5-7) 6-3.
Having faced compatriots in rounds one and two, Mahut faces another in the last eight in the form of Jo-Wilfried Tsonga.
Second seed Gilles Simon will face Gilles Muller in the next round after a straight-sets victory over Edouard Roger-Vasselin, while Guillermo Garcia-Lopez overcame Pierre-Hugues Herbert 4-6 6-2 6-4.
In the day’s remaining tie, Martin Klizan beat Vasek Pospisil 6-4 7-6 (9-7).