12. Novak Djokovic
Even world-class athletes aren’t immune from entry bans, as Novak Djokovic discovered in 2022 and 2023. The tennis superstar was unable to compete in major U.S. tournaments due to his decision not to receive a COVID-19 vaccine. This high-profile case, covered by BBC Sport, underscored how evolving health policies can impact the careers of sports icons, making headlines around the globe.



