In Nadal's third-round match, he made contact with a return at 58 feet, two inches from the net. That helped him crack the top 50 soon after, the youngest player to get that high in the men's rankings since Rafael Nadal did it in 2004.
"He was hitting the ball very strong and when I thought I was in control of the points, he always came back with strong shots".
For Thiem, Tuesday's quarter-final offers a chance to avenge a defeat by Nadal in his first Grand Slam final at June's French Open.
Thiem, who reached this year's French Open final where he lost to world No 1 Rafael Nadal, said the Louis Armstrong court was nearly like a clay court.
But for all their history, Rafael Nadal and Dominic Thiem have never played on hard court, and they've never played in NY. He's a very powerful player. "You guys were on my side so it was great".
"I think I played a good tie-break, but he played fantastic". Nadal's win pushed him forward to the quarter-finals. "I just hope to keep my level high against John (Isner) in the next match".
His 56 winners were erased by 59 unforced errors which in turn were three times as many committed by Nadal.
Thiem produced a stunning service exhibition‚ winning 91% of points on his first serve and never giving up a break point.
"Two matches in a row, very tough ones", said Nadal on court after the win. Raonic needed treatment on his back after the fourth set.
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Ninth-seeded Austrian Thiem is in his fourth Grand Slam quarter-final, but his first outside Roland Garros - where he was soundly beaten in the final by Nadal three months ago. But enjoying more space on the bigger Louis Armstrong Stadium court, Thiem backed up as far as he could beyond the baseline, and took the sting off the big South African's serve.
Isner endured a five-set bout in the second round of the tournament and a three hour and 26-minute blockbuster in the third, but the eleventh seed showed few signs of fatigue.
"That was an unbelievable match", the 32-year-old said. "Yeah, it was a great match", said Shapovalov.
The Czech Republic's eighth-seeded Karolina Pliskova defeated Aussie Ashleigh Barty 6-4, 6-4 to progress to the last eight for the third consecutive year.
Williams finished with 18 aces and 47 total winners.
He is 1-1 against Coric.
The opener looked to be heading for a tiebreak before Del Potro dispatched a backhand volley to earn himself two more break points in the 10th game. He went 2-for-9 (22 percent) in break points. And also the court, I think, made a big difference.
"The crowd just kept me in it, " Isner said.