Marinko Matosevic, a former tennis professional turned coach, has been banned from the sport for four years following multiple doping violations committed between 2018 and 2020. The International Tennis Integrity Agency (ITIA) reported that Matosevic's offenses included blood doping, aiding another player in doping, and the use and possession of the banned substance clenbuterol. His admission came through an interview on The First Serve, a website focused on tennis, where he revealed troubling insights into his choices during his career.

Matosevic, who peaked at world No. 39 in the ATP rankings, reflected on his actions with regret, noting that he underwent a blood transfusion towards the end of his playing days. He described feeling disgusted with himself and decided to retire just a week after his misconduct. Matosevic emphasized how quickly he realized the seriousness and recklessness of his actions and sought to use his experience as a warning to other athletes about the dangers of compromising their health for short-term gains.

His case serves as a critical reminder within the sports community about the consequences of doping and the importance of making health-conscious decisions. As a role model in the coaching realm, Matosevic aims to discourage upcoming athletes from engaging in any behavior that could jeopardize their long-term well-being, as it is crucial to maintain integrity in sports and promote a healthy future for all athletes.