There has been a massive, unexpected development at the US Open: The "Big 3" in the men's singles draw is down to one.
An ailing No. 3 Roger Federer was stunned by Grigor Dimitrov, with the unseeded Bulgarian advancing to the semifinals 3-6, 6-4, 3-6, 6-4, 6-2.
It's the first time Dimitrov, 28, has beaten Federer in eight tries. He'll next face the fifth-ranked Daniil Medvedev, who defeated No. 23 seed Stan Wawrinka earlier Tuesday. Dimitrov and Medvedev have split their two previous matches, back in 2017. Neither have reached a grand slam final.
Grigor Dimitrov beat Roger Federer in the quarterfinals of the US Open.
After the fourth set, Federer sought the trainer and left the court for a medical timeout, a rarity coming from him. His level dropped in the fifth set.
"I just needed some treatment on my upper -- what is it -- back, neck," Federer told reporters. "Just needed to try to loosen it up, crack it and see if it was going to be better.
"Yeah, but this is Grigor's moment and not my body's moment, so... it's OK."
The exit of the 38-year-old Swiss follows world No. 1 Novak Djokovic; the 32-year-old Serb retired in his match in the round of 16 against Wawrinka on Sunday because of shoulder trouble.
The lone member of the Big 3 left? That would be 18-time grand slam champion No. 2 Rafael Nadal, who is in the other half of the draw. The Spaniard, 33, continues to chase Federer, who leads the all-time men's list with 20 major titles, and to try and distance himself from Djokovic, who has 16.
Nadal faces No. 20 seed Diego Schwartzman of Argentina -- whom he is 7-0 against -- on Wednesday in the quarterfinals.
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