A tearful Coco Gauff said she had not coped well with the switch from Paris clay to Wimbledon grass after she was dumped out of the 2025 Wimbledon championships in the first round on Tuesday.

The French Open champion looked uncomfortable under the roof on Court One and failed to find any serving rhythm as she succumbed 7-6(3) 6-1 to Ukrainian world number 42 Dayana Yastremska.

Gauff was eager to give her big-hitting opponent credit for the win but said she would probably change her tactics in future during the three weeks between Roland Garros and Wimbledon.

"I just feel like the surface I maybe could have used more matches. It's like finding the puzzle," the American second seed said.

"It's a quick turnaround, so I think just trying to learn on whether it's better to train more and maybe play Bad Homburg or Eastbourne."

Gauff, 21, was knocked out in the first round at Berlin and had little other grass court practice before Wimbledon.

Her win in Paris was the second Grand Slam victory of her career following last year's US Open triumph.

"I feel like mentally I was a little bit overwhelmed with everything that came afterwards, so I didn't feel like I had enough time to celebrate and also get back into it," she said.

Gauff wiped away tears as she discussed her disappointment at failing to adjust to the surface, which she said was harder to adapt to than from clay to hard court.

"I have faith that if I can make these adjustments, I can do well here. I really do want to do well here. I'm not someone who wants to write myself off grass this early in my career, but I definitely need to make changes if I want to be successful here," she said.

"I'm trying to be positive. After the match, I definitely was struggling in the locker room. I don't like losing."

Gauff slipped over several times early in the match, while Yastremska looked sure-footed as she pummeled the American with winners from the baseline.

The Ukrainian had reached the final of the Nottingham tournament as well as the quarterfinals at Eastbourne in the run-up to Wimbledon.

Elsewhere, American third seed Jessica Pegula suffered a shock straight-sets defeat in her Wimbledon opener against Italy's Elisabetta Cocciaretto. Pegula was demolished 6-2, 6-3 by the world number 116 in just 58 minutes on Court Two.

It was a bitter blow for 2024 US Open finalist Pegula, who has never been past the quarterfinals at the All England Club.

Five time Grand Slam winner Iga Swiatek progressed to the second round by beating Russia's Polina Kudermetova 7-5 6-1 in the first round.

Olympic champion Zheng Qinwen became the second big casualty as the Chinese fifth seed was beaten 7-5 4-6 6-1 in the first round by Czech Katerina Siniakova.

Zheng powered her way to gold in Paris last year and was tipped for a strong run at the All England Club but doubles specialist Siniakova had too much grass court craft.

Siniakova, three-time women's doubles champion at the All England Club, took the opening set when Zheng netted a backhand.