With a mistake-filled performance, Sharapova lost a night match at Flushing Meadows for the first time in her lengthy career, beaten 6-4, 6-3 by No. 30 seed Carla Suarez Navarro of Spain. The feet weren't moving.
Sousa, who got past 12th-seeded Pablo Carreno Busta and No. 17 Luca Pouille to become the first Portugese man to reach a Grand Slam last 16, was irked by the chair umpire's refusal to allow a line call challenge in the seventh game of the final set.
The victor of the Djokovic-Millman quarter-final will play seventh-seeded 2014 champion Marin Cilic or Japanese star Kei Nishikori for a spot in Sunday's title match. It was Millman's first career win against a top-10 opponent, and Federer's first loss to an opponent ranked outside the ATP Top 50 (Millman is ranked No. 55).
The 13-times Grand Slam victor had made easy work of the opening set, breaking Sousa twice, the second time to close out set.
"He's just come to Switzerland to train with me before the grass-court season so we know each other quite well, a super friendly guy, and I'm very happy for him that he's gotten so far".
Tsurenko left the court for a health check after the first set and often leaned on her racket between points, saying later she felt dizzy at the Grandstand court, which doesn't offer shade the way the tournament's two bigger arenas do.
'But I got out of a tough second set and really found my feed, chose to be a little bit more aggressive. While he eventually held there, he needed to save seven break points along the way.
"It's one of the first times it's happened to me. I have prayed for that".
U.S. Ends Funding Of UN Agency That Supports Palestinian Refugees
Most are descendants of individuals who fled Palestine in the 1948 war that led to the creation of the state of Israel. They were not authorized to discuss the internal deliberations and requested anonymity.
Second seed Federer, who had not dropped a set in his first three matches, was uncharacteristically sloppy, committing 77 unforced errors and 10 double faults while landing just 49 percent of his first serves.
Elsewhere in the men's bracket, No. 7 seed Marin Cilic moves on to meet No. 21 seed Kei Nishikori in a quarterfinal.
"It's not easy", Djokovic said, "to play in these kind of conditions".
The last Japanese woman to reach the final eight in a Grand Slam had been Shinobu Asagoe at the 2004 U.S. Open.
In a grueling match which began on Monday and ended around 1am Tuesday local time, clear favorite Federer unexpectedly lost to Millman 3-6, 7-5, 7-6 (7), 7-6 (3).
Nishikori missed the U.S. Open a year ago because of a right wrist injury.
"But now I'll try to stop him, so we'll see how it goes". "But [I'm] enjoying playing every match and enjoying playing tennis again a little more than before".