The Associated Press delivers in-depth coverage on today's Big Story including top stories, international, politics, lifestyle, business, entertainment, and more.

ATP Finals: Off-colour Federer loses to Kei Nishikori in straight sets - Federer loses first match in the marquee tournament.

Tennis News: Roger Federer suffered a shock straight-sets defeat to Kei Nishikori at the ATP Finals on Sunday, severely denting his bid for the 100th title of his

ATP World Tour Finals - It can only get better for Roger Federer from here, right? It can only get better for Roger Federer from here, right?

Roger Federer's opening performance at this year's ATP World Tour Finals was nothing short of disappointing.

Flustered Federer loses ATP Finals opener to Nishikori

LONDON (AP) — Kei Nishikori hit a backhand so good it threw Roger Federer off his game as the 20-time Grand Slam champion earned a code violation before capitulating in a surprise defeat at the ATP Finals on Sunday.

Roger Federer pays for an error-strewn performance as his opening group match at the ATP Finals ends in defeat by Kei Nishikori.

Roger Federer’s bid for 100th singles title stalls at ATP Finals Roger Federer’s bid for 100th singles title stalls at ATP Finals

The 37-year-old Swiss star was beaten in straight sets by the Japanese world number nine.

https://www.si.com

News from around the web.

Angry Roger Federer suffers shock defeat to Kei Nishikori in ATP Finals opener

Roger Federer's hopes of winning a seventh ATP Finals title were dealt a major blow after he suffered a shock defeat to Kei Nishikori. The 20-time Grand Slam champion was...

Kevin Anderson marks ATP Finals debut with victory over Dominic Thiem Kevin Anderson marks ATP Finals debut with victory over Dominic Thiem

The South African won 6-3 7-6 (12/10) in an hour and 47 minutes.