Serena Williams
2018 wasn’t the best year for Williams because her powers began to wane. Meanwhile, she had multiple unsavory incidents where she demonstrated bad sportsmanship. Earlier we talked about the embarrassing U.S. Open situation. But there was another shocking moment that involved an interaction with an umpire.

The official, Carlos Ramos, cited Williams for three court violations including breaking her racket. She called him a liar and humiliated herself on the court. Later, she labeled Ramos as sexist and said that a male athlete wouldn’t have received the same treatment. Most people thought that she was being unreasonable because he was doing his job (via The Guardian).