At Wimbledon in 2017, Medvedev was fined after emptying his wallet and throwing coins at umpire Mariana Alves following a five-set loss to Belgium's Ruben Bemelmans. He disputed a series of controversial calls and said after the match "it was very hot out there" and couldn't remember if he'd asked for Alves' removal.

Russian tennis star Daniil Medvedev had a meltdown during his match against France’s Benjamin Bonzi at the U.S. Open on Aug. 24 after a photographer entered the court on match point, leading the umpire to award Bonzi another first serve.