David Goffin sailed into the Moselle Open quarter-finals with a dominant 6-4 6-2 victory over Jan-Lennard Struff on Thursday.
Champion in Metz two years ago, Goffin lost just 10 service points against the world number 87 from Germany.
Nicolas Mahut awaits Goffin after a straight-sets win over Ilya Marchenko. Another former winner, Gilles Simon, was successful, overcoming Guillermo Garcia-Lopez 6-7 (5-7) 6-3 6-4.
Lucas Pouille and Malek Jaziri also secured quarter-final berths on Thursday.