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.

A photographer walking on the court at match point sparked a decision that infuriated Daniil Medvedev and caused a six-minute delay.

Controversy arose early in the US Open, as Daniil Medvedev's first-round loss against Benjamin Bonzi featured a moment that raised eyebrows at Louis Armstrong Stadium.