6. Sibling Superiority
As individual tennis players, Serena and Venus are awesome.
Venus has her own string of titles, including winning Wimbledon five times in her seven grand slam wins.
Venus was also the first black female to be World Number One in the Open era.
So put the sisters together as a tennis doubles team and you’ve got world beating power times two.
The tally for the Williams pair is thirteen grand slam doubles finals.
Together they are the only pair to have completed a Career Doubles Grand Slam and the only pair to win a Career Doubles Golden Slam.
The sisters have won more Olympic gold medals than any other tennis player, male or female.