Top-seeded Jo-Wilfried Tsonga served 10 aces and saved all five break points to defeat Gilles Muller of Luxembourg 7-6 (9-7) 6-4 at the Moselle Open on Wednesday.

Tsonga, who won the title in Metz in 2011 and 2012, was runner-up to fellow Frenchman Gilles Simon last year.

He will face eighth-seeded David Goffin of Belgium or German Tobias Kamke in the quarter-finals of the indoor tournament.

Tsonga can still qualify for the ATP finals in London from November 9-16 with a strong finish to the season.

The Frenchman won his second ATP World Tour Masters 1000 title last month with a straight-sets win over Roger Federer.

Goffin beat French qualifier Florent Serra 6-2 6-2 while Finnish veteran Jarkko Nieminen set up a meeting with former Wimbledon semi-finalist Jerzy Janowicz after beating Sergiy Stakhovsky 6-1 6-4.

Joao Sousa saved all four break points to beat Ivan Dodig 6-2 6-2 in the first round.

The sixth-seeded Sousa will next play Igor Sijsling.