In a bizarre moment caught on camera at the Shanghai Masters, Daniil Medvedev asked the chair umpire if he could get a ball girl to remove his sweaty t-shirt. The 16th seed struggled with cramps during his last-16 win over American Learner Tien on Wednesday.With temperatures in Shanghai going over 30° Celsius, Medvedev appeared to be struggling physically. While getting a massage during a changeover, he made a failed attempt to take off his drenched shirt and then turned to the chair umpire, Mohamed Lahyani, and asked:"Sorry, can I ask the ball girl to remove my shirt? I'm cramping here. I need to change my shirt."ATP supervisor Gerry Armstrong stepped up to help him.This was the third tour-level meeting between Daniil Medvedev and Learner Tien, with the American having won the first two matches. Tien defeated the 2021 US Open winner in a five-set thriller in the second round of the 2025 Australian Open. In the China Open semifinal last week, the Russian retired due to cramps when Tien was leading 4-0 in the decider.However, Medvedev exacted revenge in Shanghai with a 7-6(6), 6-7(1), 6-4 win against the 19-year-old in nearly three hours. The Russian, who received a first-round bye in Shanghai before beating Dalibor Svrcina and Alejandro Davidovich Fokina, will face Australia's Alex de Minaur in the quarterfinals on Friday.Medvedev, who last won a singles title at the 2023 Italian Open, has had a forgettable 2025 season so far. He suffered first-round exits at three of the four Grand Slams. The Russian reached his only final at the ATP 500 Halle Open, where Alexander Bublik defeated him 6-3, 7-6(4).Daniil Medvedev brings up Rafael Nadal upon receiving code violation in ShanghaiDaniil Medvedev and Rafael Nadal - Source: GettyDuring the second set of his match against Learner Tien in Shanghai, Daniil Medvedev received a code violation for not getting ready in time to return his opponent's serve.The World No. 18 confronted the chair umpire in between the second and third sets, arguing that he had never seen former player Rafael Nadal getting penalized for a similar offense."All my life, I've been serving and waiting for Rafa for 55 seconds. And you give me a code violation on the first occasion. I played Rafa five times, there was not one time I was ready to serve and he was ready to return. He didn't get one time violation," Medvedev said (via Mundo Deportivo).Medvedev and Nadal have clashed six times, with the Spanish legend winning five of the encounters, including the 2019 US Open and 2022 Australian Open finals, both of which were five-setters.