Serena Williams takes on big sister Venus in the main event of day five at the U.S. Open on Friday, while defending men’s champion Rafa Nadal and women’s champion Sloane Stephens are also in action at Flushing Meadows. The 30th career meeting between Serena and Venus also marks the first time the sisters have faced each other this early at a Grand Slam since their first meeting at a major — the second round of the 1998 Australian Open. Venus is the 16th seed, one place above her sister who is still working her way back up the rankings after returning from maternity leave earlier this year. Read more