Thiem beats Federer in three sets to reach Mercedes Cup final

our teams. Your favorite writers. Wherever you want them. Personalize SI with our new App. Install on iOS (iOS or Android)

STUTTGART, Germany (AP) Roger Federer squandered two match points and lost to Dominic Thiem 3-6, 7-6 (7), 6-4 in a rain-interrupted Mercedes Cup semifinal on Saturday.

Thiem led 5-0 in the second set before allowing the top-seeded Federer to pull even by winning five straight games. In the tiebreaker, Federer wasted one match point with a smash into the net. On the second, he tried to serve and volley behind a second serve but was passed by an impeccable return. Thiem won the set with a smash.

''I was incredibly nervous. I was fortunate in the tiebreaker but you need good luck to beat the best player on grass,'' Thiem said.

Tennis
Timeline: See how Federer, Nadal, Djokovic have dominated Grand Slams

​Thiem beat Federer in the third round of the Italian Open before Federer took a month off to deal with a back injury. That win was on clay, while Saturday's came on grass, Federer's favorite surface.

''I can't believe that I beat him on grass,'' said Thiem, who has little experience on grass. Federer is a seven-time Wimbledon champion.

Thiem won the match when Federer sent a backhand wide on Thiem's second match point. The match was twice interrupted by rain, both times for 30 minutes. The second delay came right after Thiem broke for 4-3 in the third set.

Federer was still without a title this year. He had knee surgery after losing in the semifinals of the Australian Open to Novak Djokovic and was forced to skip the French Open because of the back injury. He's ranked No. 3.

Thiem, with three ATP titles this year, reached his maiden Grand Slam semifinals at the French Open, and the Austrian has jumped to No. 7 in the world.

Thiem will play either Juan Martin del Potro or Philipp Kohlschreiber for the title.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide—from Peter King, Tom Verducci, Lee Jenkins, Andy Staples, Grant Wahl, and more—delivered straight to you, along with up-to-the-minute news and live scores.