U.S. Open Day 5Updated 2208 GMT (0608 HKT) September 4, 2015 Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds. Photos: Could Serena Williams, left, and Venus Williams, right, face off at the U.S. Open? They're getting closer after Venus topped Belinda Bencic on Friday. Hide Caption 1 of 7 Photos: It was a fine win for Venus, since Bencic was seeded 12th and is one of only two players to defeat Serena Williams this year. Hide Caption 2 of 7 Photos: Marin Cilic, the men's defending champion, remained in line to repeat his 2014 heroics. It wasn't easy, though, as Cilic trailed by a set and 5-2 before winning in five sets against Mikhail Kukushkin. Hide Caption 3 of 7 Photos: Cilic stunned the tennis world when he triumphed in New York a year ago, ousting, among others, Roger Federer and Kei Nishikori. Hide Caption 4 of 7 Photos: Novak Djokovic has won two of the three majors on the men's side this year to lift his grand slam tally to nine.Hide Caption 5 of 7 Photos: Djokovic, who owns one U.S. Open title, beat Andreas Seppi in straight sets to land in the fourth round. Hide Caption 6 of 7 Photos: Benoit Paire upset Nishikori in the first round and has kept on winning. He's into the fourth round at a grand slam for the first time after breezing past Tommy Robredo. Hide Caption 7 of 7Novak Djokovic, Marin Cilic and Venus Williams were among those in early action Friday at the U.S. Open.