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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. Streeter Lecka/Getty Images
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. GLYN KIRK/AFP/Getty Images
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. Streeter Lecka/Getty Images North America/Getty Images
Cilic stunned the tennis world when he triumphed in New York a year ago, ousting, among others, Roger Federer and Kei Nishikori. Chris Trotman/Getty Image/file
Novak Djokovic has won two of the three majors on the men's side this year to lift his grand slam tally to nine. Michael Heiman/Getty Images North America/Getty Images
Djokovic, who owns one U.S. Open title, beat Andreas Seppi in straight sets to land in the fourth round. Michael Heiman/Getty Images North America/Getty Images
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. Streeter Lecka/Getty Images North America/Getty Images
