BASEL, Switzerland (AP) Roger Federer was pushed to three sets before beating Philipp Kohlschreiber 6-4, 4-6, 6-4 in the Swiss Indoors second round on Thursday.
The match swung on a single break of serve in each set, and top-seeded Federer took two of only three break-point chances he had.
Federer broke for a 5-4 lead in the deciding set when the 32nd-ranked German sent a crosscourt forehand wide.
Federer, seeking a seventh title at his hometown event, will play David Goffin of Belgium in Friday's quarterfinals.
Donald Young beat fourth-seeded Kevin Anderson of South Africa 6-2, 7-6 (6) to set up an all-American quarterfinal in Federer's half of the draw.
Young next faces Jack Sock, who beat another compatriot, sixth-seeded John Isner, 7-6 (5), 6-3.