Serena Williams is the most dominant athlete male or female that has ever lived. She won her first US Open in 1999 and for 21 straight years not ONE player has a winning record against her, in an era considered to be one of the greatest in women's tennis, from Azareknka to her sister Venus, no one has ever come CLOSE to a winning record. Every single major title on every surface and matches that aren't even close, like 2019 against Sharapova 6-1 6-1. This would be the equivalent of an NBA finals where one team was consistently winning 130-75. And Sharapova is going to be in the hall of fame.
21 straight years no one can beat her. She is pushing 40 years old and took time off to have a baby and is STILL a strong contender to win all majors. Part of this is racial as few blacks play tennis and her athleticism is the equivalent of Jordan playing in an all white NBA.

"Venus and Serena Williams had claimed that they could beat any male player ranked outside the world's top 200, so Karsten Braasch, then ranked 203rd, challenged them both.
Braasch was described by one journalist as "a man whose training regime centered around a pack of cigarettes and more than a couple of bottles of ice cold lager". The matches took place on court number 12 in Melbourne Park,
after Braasch had finished a round of golf and two shandies. He first took on Serena and after leading 5–0, beat her 6–1. Venus then walked on court and again Braasch was victorious, this time winning 6–2. Braasch said afterwards, "500 and above, no chance".
He added that he had played like someone ranked 600th in order to keep the game "fun" and that the big difference was that men can chase down shots much easier and put spin on the ball that female players can't handle. The Williams sisters adjusted their claim to beating men outside the top 350."