The never-ending GOAT debate is something controversial in any sport but for Serena Williams, it's quite clear that Roger Federer is the GOAT.
Serena Williams is one of the best tennis players of all time. Some say she is the greatest of all time while other's don't but the 23x Grand Slam champion has her own favourite in the GOAT debate. Asked about Federer's legacy Serena said:
"He's just a synopsis of greatness and class and amazing and really changed the game. You see players playing like him, moving like him, doing his techniques. The guy is (a) genius."
Serena has been a longtime admirer of Federer but on the other hand, you will not find a lot of people who are not long time admirers of Federer and his play. His impact on the game of tennis has been immense on and off the court and there has probably never been a more universally liked player than him.
Serena followed up her comment by endorsing him as the greatest player of all time saying:
"I just feel like he is really the greatest player. You can't like the guy, that's how I feel. His game is so fantastic. If I could only play like him."