Frances Tiafoe celebrates after scoring a point against Alexander Shevchenko of Kazakhstan in the second round of the U.S. Open in New York. Pamela Smith/Associated Press

NEW YORK — Frances Tiafoe is getting the rematch he wants, a second shot at Ben Shelton at the U.S. Open.

But there won’t be a second straight Grand Slam title for Barbora Krejcikova.

The Wimbledon champion was knocked out of the U.S. Open in the second round on Wednesday, defeated by Elena-Gabriela Ruse, 6-4, 7-5.

The No. 8-seeded Krejcikova won her second Grand Slam singles title this summer, but then she didn’t play any matches after the Paris Olympics. She acknowledged last week not knowing where her level of play was.

Turns out, it wasn’t good enough.

“I mean, winning Wimbledon is amazing. It’s a great, great, great result, I’m very proud about it and how I was able to handle everything there,” said Krejcikova, who hadn’t played a tournament on hard courts since February.

“I think I was playing quite well, definitely better than in the first match. I think my game was improving, but it just wasn’t enough.”

Barbora Krejcikova, of the Czech Republic, returns a shot to Elena-Gariela Ruse, of Romania, during their match at the U.S. Open on Wednesday. Kirsty Wigglesworth/Associated Press

No woman has won Wimbledon and the U.S. Open in the same year since Serena Williams in 2012.

Tiafoe had short work on the steamiest day of the tournament thus far, with temperatures in New York surpassing 90 degrees. The No. 20 seed won the first two sets before his opponent, Alexander Shevchenko, retired after the first game of the third set – one of two men’s matches in which a player stopped.

Shelton, the No. 13 seed, beat Roberto Bautista Agut, 6-3, 6-4, 6-4. He ousted Tiafoe last year in the quarterfinals, stopping Tiafoe from what would have been a second straight trip to the semifinals.

“Obviously he’s very much like me in how excited and energetic he is on the court,” Tiafoe said, “and has such a big game and big shots and serves big and gets the crowd going.”

Ruse, a 26-year-old from Romania, advanced to the third round of a Grand Slam for the first time and will play No. 26 seed Paula Badosa, who eliminated American Taylor Townsend, 6-3, 7-5.

Badosa continued her resurgence in a strong summer by reaching the third round of the U.S. Open for the first time.

“I know it’s just a third round, but I was really looking forward to doing this in New York,” said Badosa, a Spaniard who was born in New York.

Jiri Lehecka ignored the heat to engineer the biggest comeback of his career, rallying to beat Mitchell Krueger, 6-7 (5), 0-6, 6-4, 6-4, 7-5 in, a match that finished a minute shy of four hours. Lehecka, the No. 32 seed, not only came from two sets down for the first time in his career, but he was even down 3-0 in the third set against the American qualifier.

“I kind of dug back into the match with a big fight, and then the fourth set and fifth set was just a battle and we were both fighting for every point,” Lehecka said.

He will face No. 6 seed Andrey Rublev, who also came from two sets down to outlast Arthur Rinderknech, 4-6, 5-7, 6-1, 6-2, 6-2.

Past U.S. Open finalists Aryna Sabalenka and Alexander Zverev won in straight sets, while Olympic gold medalist Zheng Qinwen, the No. 7 seed, rallied passed Erika Andreeva in three sets.

No. 14 seed Madison Keys rolled past Maya Joint, 6-4, 6-0, and next plays No. 33 Elise Mertens, who knocked out Ajla Tomljanovic, 6-3, 6-2.