Rublev, 19, was a junior standout whose transition to the ATP-level has gained momentum this year. This time two years ago, the biggest splash he made during the U.S. Open was an appearance in a One Direction cover band.
Dimitrov had been the highest seed whom top-seeded Rafael Nadal could have faced before the quarterfinals, and his exit further opens that quarter of the draw. Rublev will next face 56th-ranked Damir Dzumhur of Bosnia and Herzegovina, who was a 4-6, 6-4, 6-0, 6-1 winner over Cedrik-Marcel Stebe of Germany.
No. 1 Pliskova Struggles
Karolina Pliskova, the No. 1 ranked WTA player, had to fight through three difficult sets on Thursday afternoon to keep her United States Open run alive. She came away with a victory over the American Nicole Gibbs, winning, 2-6, 6-3, 6-4.
“I think she was playing really aggressive from the baseline,” Pliskova said of Gibbs in an on-court interview after the match. “I’m just happy I closed it with my serve.”
There were times that Pliskova was visibly frustrated during the match. Midway through the second set, leading by 5-3, she pressed her forehead up against the padded wall at Arthur Ashe Stadium. She had already slammed her racket against the court after losing an earlier point to No. 127-ranked Gibbs.
She was able to gain some momentum back during the second set, which she won.
The crowd seemed to be on the side of Pliskova’s American opponent. There were one or two voices that would shout out, “Go, Karolina,” but as a group, spectators cheered loudly when Gibbs scored and let out audible sighs when she made an error.
Pliskova and Gibbs have faced off twice before — in Seoul, South Korea, in 2014 and in Sydney, Australia, in 2015. This is the first time Pliskova triumphed.
Pliskova will need to reach the final to have a chance at retaining her No. 1 ranking. — MALIKA ANDREWS
Live: Thursday’s Results
■ Another seeded player will not be continuing here. Jennifer Brady upset No. 23-seeded Barbora Strycova in dominant fashion on the Grandstand.
“I came out with lots of energy and I played her before, so I knew what to expect,” Brady said of the 6-1, 6-1 victory in an on-court interview. “I think I learned her game style and the way she competes. I knew it was going to be a tough match, so I brought my A game and I’m happy I played well.”
Brady, who entered the Open ranked No. 91, lost to Strycova in Stuttgart, Germany, in April. Strycova had 25 unforced errors and only six winners in the match.
■ Fourth-seeded Elina Svitolina continued her quest to leave the Open with the WTA’s No. 1 ranking, beating Evgeniya Rodina of Russia, 6-4, 6-4, at Arthur Ashe Stadium.
Svitolina is one of six women in contention to finish the Open ranked No. 1.
After the match, she said that even though earning that spot would be nice, it was not at the forefront of her mind while she is playing.
“I don’t think about those things,” Svitolina said on the broadcast after her match. “Of course, for each player, to reach No. 1 in the world is a massive deal and it’s great, but I really want to go far in this tournament and take it one match at a time.”
■ Struggling with what appeared to be a back injury, 15th-seeded Tomas Berdych lost to Alexandr Dolgopolov, 3-6, 6-1, 7-6 (5), 6-2.
■ Juan MartÍn del Potro, the No. 24 seed, rolled into the third round with a 6-2, 6-3, 7-6 (3) victory over the qualifier Adrian Menendez-Maceiras. He will play 11th-seeded Roberto Bautista Agut, who beat Dustin Brown, 6-1, 6-3, 7-6 (3).
— MALIKA ANDREWS
Matches to Watch on Thursday
How to watch: You can stream matches here (streaming began at 11 a.m., Eastern time). TV coverage begins on ESPN2 at 1 p.m.
No. 15 Madison Keys vs. Tatjana Maria
Not before 5:30 p.m., Louis Armstrong Stadium
Keys has reached the fourth round here in each of the last two years and faces the 61st-ranked Maria of Germany as she aims to make it back to the second week. The two met at Wimbledon in 2015, and Keys won in straight sets. Look for her to replicate that result, as her power game matches up well with Maria’s one-handed backhand.
No. 8 Svetlana Kuznetsova vs. Kurumi Nara
Fourth match, Grandstand
Kuznetsova won the United States Open in 2004 and was a finalist three years later. But she has not advanced past the third round here since 2013. Nara was only 13 when Kuznetsova picked up her Open trophy. The two have met once before, when Nara was a teenager, and Kuznetsova won handily. Kuznetsova rallied to win a grueling first-round match against Marketa Vondrousova on Wednesday and needed treatment on her left wrist. — DANIEL GENDLER
■ Fourth-seeded Alexander Zverev, the highest seed on the bottom half of the men’s singles draw, crashed out of the tournament with a four-set loss in the second round to a fellow 20-year-old, Borna Coric.
■ No. 14-seeded Nick Kyrgios, another young star, flamed out in the first round, struggling with a shoulder injury in a loss to John Millman, ranked 235th.
■ As some rising young stars fell, another grew brighter: 18-year-old Denis Shapovalov ousted eighth-seeded Jo-Wilfried Tsonga in the second round.
■ Maria Sharapova’s Grand Slam comeback continued with a win over Timea Babos, and now she has a wide-open draw, too. No. 16 Anastasija Sevastova is the highest remaining seed in Sharapova’s quarter of the draw.
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