The Serbian has a fantastic record against Monfils, winning in each of 12 matches they've played.

Djokovic's right arm was massaged by a trainer in his first- and fourth-round matches at the U.S. Open, so getting all of these free passes hasn't been a bad thing.

Djokovic led Jo-Wilfried Tsonga 6-3, 6-2 when the French ninth seed retired because of a left knee injury.

"I'm in the semifinals, so that's what matters for me the most", Djokovic told reporters after 83 minutes in the Arthur Ashe Stadium.

It all began in the second round when Jiri Vesely withdrew with a forearm complaint. He has had to play only two complete matches and a total of about 6½ hours of tennis to reach the semifinals. Thus, he finally moves on to the semi-finals, while Tsonga retired due to his worsening knee injury.

"It's unusual, I've never had this at a Grand Slam", Djokovic said on ESPN. "But again, I kept my composure". Whether it was a let-down after the biggest win of his career or sheer fatigue, his 44 unforced errors meant he never stood a chance against a dialed-in Monfils.

"This Grand Slam is very unique for me", acknowledged Djokovic, who is in the U.S. Open semifinals for the 10th consecutive year. "I think he's a great champion. Yes, it's gifted, but it's a lot of work". Monfils, Pouille and Tsonga gave France a trio of quarterfinalists at the American Grand Slam tournament for the first time in 89 years.

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He has a reputation among his peers as a magnificent athlete and a reputation among the fans and the media as a showman: if there is an impossible trick shot to be tried, Monfils is the man to do it. "I just felt so good (and) it was going to be even better because it was going to be indoors". The Dane won the first 10 games of her match, and it looked like we were headed for a. "That's the position where I want to be". So what's the point to make the show and lose? "That's all I can do on my end".

"I'm happy with that and where my game is".

"For him it s different", Monfils said. "I always say that the French is my home, but this one is my second". "Still moving good. I'm very happy".

'I came out with the right intensity.

No. 1 Novak Djokovic advanced on the men's side with another gift, while the impressive run of the unseeded Caroline Wozniacki as only been extended, as she also eased her way through on the women's side.

Former No. 1 Caroline Wozniacki reached her fifth U.S. Open semifinal by beating Anastasija Sevastova of Latvia 6-love, 6-2. In the second, her power-hitting simply destroyed the Italian.

In his first five rounds he did not face an opponent inside the top 45 while he had to save a match point to beat Britain's Dan Evans in the third round. "I still won two games", Sevastova said.