STUTTGART, Germany (AP) Top-seeded Roger Federer cruised in the tiebreakers to beat German qualifier Florian Mayer 7-6 (2), 7-6 (1) for a place in the Mercedes Cup semifinals on Friday.
Federer struggled in some parts of the match but was at his best when most needed. He saved a set point to force the second tiebreaker, and fired a powerful forehand to clinch the match.
His next opponent will be rising star and third-seeded Dominic Thiem, who beat him in the third round of the Italian Open before Federer went on a monthlong break because of a back injury.
Thiem, from Austria, came from behind to beat Mikhail Youzhny of Russia 3-6, 6-4, 7-5.