Despite the fact that Serena Williams has bested the top names in tennis from around the world, she's consistently said that one person is better than them all, and is her toughest competition: her sister, Venus Williams. In an interview with ESPN following her victory over Venus at the 2015 U.S. Open, Serena explained, "She's the toughest player I ever played in my life, and the best person I know. So it's going against your best friend and going against, for me, the greatest competitor in women's tennis."
Serena was able to best her sister in 6-2, 1-6, 6-3 sets, though it was clear that the game was emotional for both girls. As ESPN noted at the time, it appeared that Serena was fighting tears at different points throughout the face-off. While Serena has a victory edge over her sister Venus, she told CNN ahead of the U.S. Open that her sister was "the only player in the draw I don't want to play, not only because she's my sister, but for me, she's the best player."
