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Petra Kvitova, the No. 5 seed in the women’s draw, had no trouble with Anna Karolina Schmiedlova.Credit Geoff Burke/USA Today Sports, via Reuters

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Petra Kvitova and Anna Karolina Schmiedlova took the Arthur Ashe Stadium court at 11:10 a.m. Saturday, about 10 hours after Rafael Nadal and Fabio Fognini departed it.

The stadium had been meticulously cleaned and was mostly empty as fans were slowly making their way inside and around the grounds.

There were no echoes of “Vamos!” or “Forza!” remaining from another memorable night session at the United States Open, when, for the first time in more than 10 years, Nadal lost a match after winning the first two sets.

One definitive remnant of Friday’s late-night drama was the men’s singles draw posted outside Louis Armstrong Stadium. It showed Fognini, not Nadal, in the fourth round.

But it was fun to imagine which of the scuff marks on the Ashe court Saturday morning could be evidence of one of Fognini’s scorching forehands or footprints of a long rally from the 3-hour-46-minute slugfest that ended at 1:27 a.m.

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Still, it was a new day at the Open, a time for someone else to step into the spotlight.

The Top Tennis Player in the World Started Here Long before he found his way to the top of the sport, where did Novak Djokovic learn to swing a racket? We visit the childhood courts of some of the world’s tennis greats.

That person was Donald Young. For the second time this tournament, Young lost the first two sets and rallied to win, defeating No. 22 Viktor Troicki, 4-6, 0-6, 7-6 (3), 6-2, 6-4.

Before this tournament, Young, a former teenage prodigy who recently turned 26, was 0-17 in matches in which he lost the first two sets. With Saturday’s victory, he matched his best result in a Grand Slam event by reaching the round of 16.

In front of an overflow crowd at the Grandstand, which chanted his name during changeovers, Young closed the match with a forehand winner down the line that set off a robust celebration on the court and in the stands.

Next, Young will play No. 5 Stan Wawrinka, whom he beat in five sets the last time they played at the Open, in 2011. “It was 90 percent you guys, 10 percent me,” Young told the fans in a postmatch interview.

Victoria Azarenka’s 7-5, 2-6, 6-4 victory over Angelique Kerber was a worthy successor to Fognini-Nadal on Ashe, with its go-for-broke shot-making and spectacular grit. For nearly three hours, No. 20 Azarenka and No. 11 Kerber traded winners and fist-pumping, arm-raising exhortations.

Azarenka had 51 winners to Kerber’s 46. There were 52 rallies of nine shots or more, nearly evenly split, with Kerber taking 27 and Azarenka 25. There were eight games with 10 points or more. Kerber saved five match points in a raucous 16-point game at 3-5 in the third set.

Roger Federer lives in the spotlight, but he has not toiled in it so far in the tournament. He enters the second week having not lost a set, topping No. 29 Philipp Kohlschreiber, 6-3, 6-4, 6-4.

2015 U.S. Open

His week has been so relaxed that he is spending his off days as a tourist. He has gone to the Metropolitan Museum of Art and seen “Hamilton” and “Finding Neverland” on Broadway.

John Isner must have been happy that Federer took care of Kohlschreiber this time. Isner had lost to Kohlschreiber in the third round of the Open three years in a row. Instead, Isner defeated Jiri Vesely, who retired after losing the first two sets Saturday, 6-3, 6-4. Vesely is the 16th retirement in singles, and the 14th on the men’s side.

Isner, the No. 13 seed and the top-ranked American, reached the round of 16 for the first time in four years. There he will meet Federer in their first match at the Open since 2007, when Isner was a 22-year-old just out of college.

“Absolutely no pressure on me that day, and I honestly probably didn’t believe I could beat him, either,” Isner said of his 6-7 (4), 6-2, 6-4, 6-2 third-round loss. “I was happy to be on that court. I was fresh out of college, and no one knew anything about me. He certainly didn’t. I won one set, which was incredible. Didn’t win much after that.”

The round of 16 in the women’s singles draw will feature some new faces who are happy to be there.

Varvara Lepchenko, a 29-year-old American, advanced to the fourth round of the Open for the first time. She will next face Azarenka.

Johanna Konta of Britain, ranked 97th, followed her upset of No. 9 Garbiñe Muguruza by ousting No. 18 seed Andrea Petkovic, 7-6 (2), 6-3, and is in the second week of a Grand Slam tournament for the first time.

Saturday’s victory was Konta’s 16th in a row, and she is the second qualifier to reach the fourth round, after 152nd-ranked Anett Kontaveit, who will play Venus Williams on Sunday.

“I feel just as I did two weeks ago,” Konta, 24, said. “I haven’t exactly grown wings or anything.

“Yeah, I must say I’m happy with how I have been playing so far this week, but my feet are firmly on the ground.”

Her next opponent, Kvitova, is firmly off the grounds, so to speak. She announced last month that she had a received a mononucleosis diagnosis, and she is conserving her energy here. She has spent only 3 hours 15 minutes on court after dispatching Schmiedlova, 6-2, 6-1.

Kvitova, the No. 5 seed, said she had been spending most of her free time resting at her hotel. On her off days, she said, she practices little, napping and watching movies instead. She is avoiding the locker room and the grounds as much as possible, which may be wise. Petkovic needed medical attention against Konta for what she said was a cold that has hit many players.

Lisa Raymond, who retired after a women’s doubles loss on Thursday only to unretire after gaining late entry into the mixed doubles tournament, could officially call it a career after she and Jamie Murray lost to Yaroslava Shvedova and Juan Sebastian Cabal.

Lleyton Hewitt, playing what he says is his last Open, also exited the spotlight, falling in doubles with Sam Groth to Colin Fleming and Treat Huey, 6-3, 6-4.

NOTES

Eugenie Bouchard, the No. 25 seed in women’s singles, withdrew from her doubles and mixed-doubles matches after sustaining a head injury when she fell in the locker room Friday night. According to a statement by the tournament director David Brewer, medical personnel continue to assess the severity of the injury and recommended that Bouchard not play Saturday. No decision was made about her singles match against Roberta Vinci on Sunday.

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