Stan Wawrinka beat 17-time Grand Slam champion Roger Federer, his Swiss Davis Cup teammate, in straight sets to reach the semifinals of the French Open on Tuesday.

Wawrinka next will face American Steve Johnson, whobeat Sergiy Stakhovsky 2-6, 6-3, 7-6 (5), 7-6 (6). Fifth-seeded Kei Nishikori, last year's US Open runner-up and the last remaining of five ...

Wawrinka was at his exquisite best as he cruised to a 6-4 6-4 6-0 quarter-final victory in one hour, 46 minutes at the US Open.