The top two seeds in Metz may have their hands full when they take the court for quarterfinal action on Friday. Stan Wawrinka is facing Philipp Kohlschreiber and Gilles Simon is going up against Gilles Muller.

(1) Stan Wawrinka vs. (5) Philipp Kohlschreiber

Wawrinka and Kohlschreiber will be going head-to-head for the third time in their careers and for the first time since 2008 when they clash in the quarterfinals of the Moselle Open on Friday. Their two previous encounters came seven years ago, when Wawrinka prevailed 6-3, 6-4, 6-3 at Roland Garros and 3-6, 7-5, 7-6(5) at the Madrid Masters (played on indoor hard courts at that time). Speaking of third-set tiebreakers, the top-seeded Swiss survived one in his opening match on Thursday; he outlasted Dustin Brown 4-6, 6-3, 7-6(4). Wawrinka, who is coming off a semifinal showing at the U.S. Open and a five-set Davis Cup win over…