Tennis is not my sporting preference, but I used to watch Brazilian tennis player Guga's games in the 1990s and early 2000s, so I vote for him.
https://pt.wikipedia.org/wiki/Gustavo_Kuerten
Guga
Gustavo Kuerten (Florianópolis, September 10, 1976), known as Guga, is a former Brazilian professional tennis player, decorated with a position in the Hall of Fame of the Association of Professional Tennis Players (ATP). Three-time champion of Roland-Garros, he is considered the greatest male tennis player in the history of Brazil and one of the greatest tennis players in the history of world tennis. He is the only tennis player in history to beat Pete Sampras and Andre Agassi in the same tournament.