Serena Williams announces her retirement from pro tennis. She was an amazing dominant force in women's tennis.
Venus was certainly the hyped one at the very beginning. It was very apparent early though that Serena was the one.
In the beginning of their careers, Venus was the better player. Serena had more dominance in the end.
When Venus was winning majors and Serena was relatively unknown, their father repeatedly said that Serena would end up being better. People thought he was just being a blowhard (as he was wont to be), but it became obvious very early on that she was the more talented sister. She combined that talent with an iron will to win and an aura of intimidation to make her as dominant as any athlete can be.