2015 was the greatest season in Novak Djokovic's career, winning 82 out of 88 matches and lifting 11 trophies, 10 of those at the biggest events, out of 14 in total!
"They were loving his effort, rewarding him with a great round of applause", he said of the Arthur Ashe Stadium crowd after a 25-shot rally.
He will now face Novak Djokovic or John Millman on Friday. At 2-2 in the second set Millman was allowed to leave the court to change his kit after the umpire ruled that the playing surface had become unsafe because of the floods of sweat dripping off the 29-year-old.
Novak Djokovic put aside all of it, from his opponent's unheard-of, middle-of-a-set chance to change out of sweat-soaked clothes and shoes to consecutive time violations because Djokovic let the serve clock expire to the 16 break points he wasted.
When Millman apologized for leaving the court at that juncture, Djokovic replied, "I'm fine to have a little rest", then sat down on his sideline bench without a shirt on and cooled off.
If Djokovic wins in NY, he'll join Pete Sampras on 14 grand slam triumphs, a total only bettered by Roger Federer and Rafael Nadal.
Against Cilic he labored for 4 hours and 8 minutes.
The Croat rebounded to take the fourth and the rollercoaster ride continued into the fifth with Nishikori grabbing the advantage with a break at 3-1 and taking Cilic's serve again with a blistering return victor to close out victory.
Things started well for the two-time victor as he raced into a 3-0 lead, and despite Millman's best efforts he could not claw the break back as the Serb remained comfortable on serve.
It was a case of sweet revenge for Nishikori as he outlasted Cilic, four years after losing to the Croatian player in the final of the US Open.
The No. 21 seed gave Japan a men's and women's semifinalist at the same Grand Slam tournament for the first time in the professional era.
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For Osaka, who is 20, this is her first trip past the fourth round at a major.
It's the first time that a Japanese man and woman have made the semis at the same Slam.
The No. 6 seed won the 2:49 match 6-3, 6-4, 6-4.
Francesca Schiavone has retired from tennis after a career in which she won the French Open title and three Fed Cup championships with Italy.
It was just the latest in what's been a dominant run for Osaka.
Cilic was trying to get back to the US Open semifinals also for a third time, but 70 unforced errors did him in.
Roger finally scored a break in the 12th game to clinch the set 7-5 and level the overall score at 1-1 after an hour and 43 minutes. I'm happy to come back, make semis.
It was clear that it could be a long night when the players battled for more than 15 minutes in the sixth game of the opening set, Millman saving four break points.
The American fired 22 winners and six aces past Suarez Navarro who had knocked out former champion Maria Sharapova in the previous round. It's one of the first times it's happened to me. Keys said she will look to home support on Thursday when she resumes her rivalry with Osaka.