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.

Daniil Medvedev smashed his racquet to pieces in an epic courtside meltdown after losing to Benjamin Bonzi of France in the first round of the US Open on Sunday (24 August). Medvedev spent almost a minute destroying his racquet after a difficult loss that included a controversial first serve awarded to Bonzi earlier in the match.