Vandeweghe tops Safarova for 1st US Open quarter

The remaining last-16 tie of the day sees 2009 champion Juan Martin del Potro the 24th seeded Argentine up against Austrian sixth seed Dominic Thiem

Rafael Nadal of Spain races to return a shot to Alexandr Dolgopolov of Ukraine during the fourth round of the U.S. Open

"It was more precaution".

One of the great rivalries sport, Federer and Nadal have clashed 37 times over the years but never stood across from each other on Flushing Meadows' hardcourts. I'm not anxious about it.

Federer took a medical timeout fore a sore back after the second set and otherwise showed no signs of trouble.

It also represented a newfound dominance in this year's event after his straight-sets win over Feliciano Lopez in the third round.

"I have a good shots". "Yeah, back to the '80s".

Monday is the Labor Day holiday in the U.S. and to celebrate the U.S. Open is hosting its first Military Appreciation Day at Flushing Meadows, which will include discounted tickets for the military and appearances by high-ranking officers, who will conduct the ceremonial coin tosses before matches.

He will face Juan Martin del Potro in the quarterfinals.

Standing between Federer and a semi-final berth is towering Argentine Juan Martin del Potro, who beat the former-world number one in the 2009 final to lift his only grand slam title. "That's something that didn't happen before and is something unusual, because we played a couple of times in all the important events of the world, so will be excited and I will be very excited to play that match, of course".

"I think I had quite high expectations, and obviously I knew I had quite an OK draw, so there was nobody, like, unbeatable for me", Pliskova said.

"I just ran straight to the physio". CoCo dropped to her knees and looked upward after match point, saying afterward she was thinking of her family. Crowd was really into it.

Del Potro long has been popular, but became even more so since returning from three operations on his left wrist that kept him out of Grand Slam action for two years and sent his ranking out of the top 100.

That has had an effect on his two-handed backhand, to be sure, but the righty swing that produces massive forehands and serves is still intact - as Federer himself noted at his news conference and on Twitter.

World number one Nadal, who could meet old rival Roger Federer for the first time in NY at the semi-final stage, crushed Ukraine's Alexander Dolgopolov 6-2, 6-4, 6-1.

When a reporter relayed to del Potro that Federer had spoken glowingly about him, del Potro responded: "Well, of course, I admire him, too".

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