27. Alexander Zverev
Zverev is one of the most exciting tennis players on the planet. But the young German also has a vicious temper as a hapless umpire discovered. He played at the Mexican Open in 2022 when it all went wrong. The umpire cited him for a violation but Zverev reacted badly (via Yahoo Sports). Nobody can justify assaulting an official because of a controversial decision.

He lashed out and whacked the umpire’s stool with his racquet. This caused it to break and the tournament kicked him out. They hit him with a fine and the ATP suspended him for eight weeks. It was embarrassing for him because there was no justifying that reaction.