India''s Yuki Bhambri and Anirudh Chandrasekar bowed out of the US Open after both suffered first-round defeats in the men''s doubles here.

Bhambri and his New Zealand partner Michael Venus were beaten by American pair Ryan Seggerman and Patrik Trhac 7-6 (4), 7-6 (3) in a closely fought opening-round contest.

The defeat was a disappointing result for Bhambri and Venus, who had reached the semifinals at the US Open last year.

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Chandrasekar, partnering Belarus'' Ivan Liutarevich, also went down fighting, losing to British duo Arthur Fery and Joshua Paris 4-6, 7-5, 4-6 in the first round.

Zheng Qinwen was on her back with her arms in the air, celebrating a U.S. Open victory maybe only she believed was possible.

Madison Keys fought off tears as she tried to explain how Zheng, way down and all but out, somehow got the win.

Zheng, the Olympic gold medalist, extended her return to the U.S. Open on Saturday with a spectacular and stunning rally, winning the final seven games to eliminate No. 22 Keys 1-6, 7-6 (3), 7-5.

"I feel like I obviously got off to a really good lead, and then I just got really - I mean, got really scared, like I couldn''t swing," Keys said. "I don''t know. Tennis just feels really hard right now, so I feel like that kind of took over."

Hours later, 13th-seeded Naomi Osaka joined her in the fourth round by defeating Elise Mertens 6-3, 3-6, 7-5, in a match that lasted two hours, 38 minutes. The two-time champion from Japan put her head on her racket after the final point, stunned herself at the victory.

"Honestly, I can''t believe I won this match," Osaka said. "I''m literally shocked that I won this match."

Not quite as big a comeback as Zheng, but Osaka was down 4-2 in the third set and apologized for expressing so much frustration throughout a tough night.

"There was a certain point, I don''t know, I felt like I put my entire heart on the court and then I just kept trying every single point," Osaka said. "I didn''t feel like I played amazing, and it was really getting me down. I was very negative on myself."

Osaka avoided the kind of exit men''s No. 9 seed Taylor Fritz endured, blowing a two-set lead and falling to No. 24 Francisco Cerundolo 3-6, 4-6, 6-3, 6-4, 6-4.

"I don''t know how I let that happen today," Fritz said.

Amanda Anisimova, like Fritz and Keys a past runner-up at the U.S. Open, also was knocked out when the No. 10 seed lost to No. 24 Anastasia Potapova 6-2, 7-5. No. 5 Flavio Cobolli, the French Open runner-up, lost in four sets to No. 28 Alexander Blockx to leave the men''s draw without six of the top 10 seeds.

Keys won a three-set match in the previous round in a match tiebreaker when she fought off five match points. Two days later came a collapse that was as out-of-nowhere as that comeback.

The 2017 runner-up rebounded after losing the second-set tiebreaker to charge out to a 5-0 lead. Zheng held but Keys had a match point while serving at 5-1, and once she couldn''t convert that, the turnaround was on, with Keys at one point banging her racket into her head repeatedly and pulling off her visor in disgust.

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"I''m just telling myself keep holding every single point, never give up, stay there and somehow little by little it just happened," Zheng said.

She won the gold medal for China at the 2024 Olympics after reaching the Australian Open final that year, and has been ranked as high as No. 4. But after elbow surgery, she is down to No. 121 and had to go through qualifying just to make the main draw.

"The hard work pays off," said Zheng, who will play 2022 U.S. Open champion Iga Swiatek next.