6: Venus & Serena Williams

They've got 24 grand slams between them and have changed the face of female tennis in ways previously thought impossible.

But perhaps the most alarming thing about the Williams sisters was just how early they began to enforce their dominance over the sport. 

The fact that they are synonymous with sport as a whole tells you all you need to know, and there's no doubt that both Serena and Venus inherited some sort of wonder gene to go with their young training.

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