Mayer was able to win both break points he had in a 6-4, 7-6 (7-4) decision over Kohlschreiber. Mayer dropped just five points over five games serving in taking the first set and won two of the three break chances for Kohlschreiber in the second.
No. 8-seeded Marcel Granollers didn't lose a game in advancing to the third round. He was up 6-0, 2-0 when Horacio Zeballos retired. Granollers had dropped only six points -- one on serve -- in the eight games against an obviously out of sorts Zeballos.
Guillermo Garcia-Lopez and Daniel Brands advanced out of the first round with tough three-set wins.
Garcia-Lopez topped Thomaz Bellucci 6-7 (7-1), 6-3, 7-6 (7-4) in a match that took nearly 3 hours. Each player had three breaks in the third set before the decisive tiebreaker. Brands was a 7-6 (7-4), 2-6, 6-2 winner over fifth-seeded Carlos Berlocq. Brands faced just two break points in the match.
Also in the first round Tuesday, Robin Haase stopped Guillaume Rufin 6-4, 7-6 (7-4); Victor Hanescu rolled over Aljaz Bedene 6-2, 6-1; Jan Hajek routed Aldin Setkic 6-2, 6-1 in 50 minutes; and, in an all-Austrian battle, Andreas Haider-Maurer defeated Dennis Novak 6-4, 6-4.