Coco Gauff vowed to adjust her approach after suffering a shock first-round defeat at Wimbledon on Tuesday, just weeks after claiming the French Open title.
The US second seed was knocked out by Ukraine's world number 42 Dayana Yastremska, losing 7-6 7-3, 6-1.
Having won two Grand Slam titles, Gauff had been tipped to make a deep run at the All England Club following her success at Roland Garros in June. Instead, the 21-year-old endured her earliest major exit since another first-round loss at Wimbledon last year.
Yastremska powered to victory in 78 minutes, joining third seed Jessica Pegula and fifth seed Zheng Qinwen among the notable early casualties on a day full of upsets.
"I think mentally I was a bit overwhelmed with everything that happened after the French Open," Gauff admitted. "I didn't really get enough time to celebrate or to reset. This was my first experience coming off a major win and having to play Wimbledon immediately afterwards. I definitely learned what I would and wouldn't do next time."