Germany's Alexander Zverev advanced to the fourth round of the U.S. Open with a routine win over Alejandro Tabilo on Saturday, while Coco Gauff also moved on as several other American contenders were eliminated.
Naomi Osaka overcame a mental and physical battle to outlast Belgium's Elise Mertens in a three-setter on Louis Armstrong Stadium.
Two of the brightest young prospects in the women's draw and close friends off it, put on a show as American Iva Jovic edged Filipina Alexandra Eala in a thrilling clash on Arthur Ashe Stadium.
After back-to-back five-setters, top seed Zverev finally enjoyed a quieter night as he overcame a small mid-match dip to see off Chile's Tabilo 6-2, 7-6(2), 6-2.
"I think today was definitely much better than the last couple of days. I think I improved a lot from the baseline," Zverev said.
"I wasn't happy with the second set. I think especially the end of the second set I lost focus a little bit. I was not moving as well. I was not playing as well. But I think the first and third sets are a big improvement to the other days. I'll try to focus on that."
Japanese 13th seed Osaka, a two-time U.S. Open champion, worked through a challenge after letting slip a one-set and break advantage before managing an Achilles niggle to beat Mertens 6-3 3-6 7-5.
The match was as much a test of Osaka's composure as her tennis, with the 28-year-old showing visible frustration before regaining control in the decider.
"Honestly, I didn't feel like I played amazing, and it was really getting me down, like I was very negative on myself, so I'm really sorry about my behavior," an emotional Osaka said.
Jovic, 18, and Eala, 21, traded momentum throughout a contest that lasted more than three hours before the American prevailed 7-5, 3-6, 7-5. Jovic, the 14th seed, will next face compatriot and fan favorite Gauff.
Fourth seed Gauff had earlier provided the day's clearest positive for the home fans, the 22-year-old beating Spain's Cristina Bucsa 6-3 6-4, as the 2023 champion looks to win a third Grand Slam crown.
Second seed Elena Rybakina continued her quest for a third major title and the top spot in the WTA rankings, advancing after a 7-6(6), 6-3 win over Yuliia Starodubtseva.
Australian Open champion Rybakina avenged the second-round defeat she suffered to the Ukrainian at the French Open. The Kazakh will face Osaka for a place in the quarterfinals.
Iga Swiatek, the 2022 champion, beat Marie Bouzkova 7-6(3), 7-6(3) while French Open champion Mirra Andreeva advanced by downing Nikola Bartunkova 6-2, 7-6(5).
The day had begun with a string of painful exits for the home players.
Past U.S. Open finalists Taylor Fritz, Madison Keys and Amanda Anisimova all crashed out in the third round, dealing a stinging blow to the home fans at Flushing Meadows.
Ninth seed Fritz had yet to drop a set in New York and looked on his way to another routine victory before Argentinian Francisco Cerundolo flipped the script and won 3-6, 4-6, 6-3, 6-4, 6-4.
It was the earliest exit in four years for the 2024 runner-up and Cerundolo will next face Belgium's Alexander Blockx, who shocked fifth seed Flavio Cobolli 6-7(4), 6-3, 6-0, 6-3.
The American women fared no better, as China's Zheng Qinwen came back from a 5-0 deficit in the decider to beat 2017 runner-up Keys 1-6, 7-6(3), 7-5 on the Grandstand, collapsing on the court in utter joy as she fights back from a career slump.
The Olympic champion reached the quarterfinals for the second straight time only two years ago but was forced to go through qualifying this time after a chronic right elbow injury derailed her career progress.
Last year's runner-up and 10th seed Anisimova was unable to reverse her fortunes in a frustrating year at the majors, with a 6-2, 7-5 defeat by Anastasia Potapova.
Young American wildcard Michael Zheng was another casualty, unable to complete a comeback against Frenchman Arthur Gea in a 7-6(7), 3-6, 4-6, 6-3, 6-2 defeat.
Gea became just the second lucky loser to reach the fourth round, after fellow countryman Corentin Moutet in 2022.
The day ended on a positive note for the home crowd, who spurred Learner Tien to a gritty 6-3 1-6 6-7(2) 6-3 6-4 win over Czech Jakub Mensik.
