METZ, France — Sam Querrey of the United States made the Moselle Open quarterfinals on Wednesday after his opponent, French wild card Paul-Henri Mathieu, retired while trailing 6-2.

METZ, France — Sam Querrey of the United States made the Moselle Open quarterfinals on Wednesday after his opponent, French wild card Paul-Henri Mathieu, retired while trailing 6-2.

Querrey broke Mathieu twice and served an ace to take the first set. Querrey will play another Frenchman in the next round, either second-seeded Gilles Simon or Kenny De Schepper.

Carlos Berlocq of Argentina and Frenchmen Nicolas Mahut and Albano Olivetti moved into the second round with straight-set wins.