Azure
G.O.A.T.
Oh yes, popularity is for sure a component but the OP said ‘important’. Importance transcends mere popularity. What the first black players manage to do is to inspire kids of a generation of players that it is indeed possible to even play the sport. What BJK or Nav did for the sport is tremendously important. Women’s tennis today is what it is thanks to women such as these. These to me are more important than mere popularity.I’m not saying they’re not important, I’m saying that Borg was more influential in terms of making tennis popular. He’s iconic. I’d agree that the Serena Williams is more important for tennis than Nadal. A lot more people who don’t care for tennis know her as an international sports icon. Nadal’s impact may be gone once he retires.
Of course fanatics and the ones motivated by mere fan wars would never see anything without removing their rose tinted glasses.