Mathieu won their only previous match in Metz, France last year.
In a first-round match, Olivier Marach of Austria topped Mariusz Fyrstenberg of Poland 6-4, 6-4, and will meet third-seeded Andrei Pavel of Romania.
Wismilak International
Top-seeded Lindsay Davenport began her bid for a fourth title this season by beating Rika Fujiwara of Japan 6-3, 6-2 to reach the quarterfinals of the Wismilak International on Wednesday.
Davenport, who had a first-round bye, saved break points at 3-1 and 5-3 to win the opening set, then broke Fujiwara twice in the second set.
"I did not play my best and know I have to get better, but typically I tend to get better as the tournament goes on," Davenport said.
Davenport will meet either Maria Elena Camerin of Italy or Ekaterina Bychkova of Russia next.
Also into the last eight were fourth-seeded Francesca Schiavone of Italy, who routed Laura Pous Tio of Spain, 6-3, 6-2, and seventh-seeded Na Li of China, who put away compatriot Zi Yan 6-3, 6-4.
US Open doubles finalist Flavia Pennetta of Italy swept aside German qualifier Martina Muller 6-3, 6-1 in the remaining first-round match.
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