2015 U.S. OPEN TENNIS TOURNAMENT
ESPN 2, 11:00 a.m. ET
Today is round four of the 2015 tournament, and the afternoon session promises back-to-back matches that are exciting to contemplate individually, and even more so as an emotional doubleheader. First comes Venus Williams, the elder sister of top-seeded Serena Williams, ranked No. 23 but still fighting her way through this tournament, who faces unseeded Anett Contaveit. Then comes younger sister Serena, who battled back fiercely in her last match against Bethanie Mattek-Sands to keep her calendar Grand Slam dream alive, squaring off against No. 19 seed Madison Keys. And if both Williams sisters are victorious today, their next matches will be against… one another.