![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.](https://media.cnn.com/api/v1/images/stellar/prod/140809194514-serena-and-venus-rogers-cup.jpg?q=w_2684,h_1701,x_0,y_0,c_fill/h_447)
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.
![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.](https://media.cnn.com/api/v1/images/stellar/prod/150627193848-bencic-stretches.jpg?q=w_3922,h_2669,x_0,y_0,c_fill/h_447)
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.
![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.](https://media.cnn.com/api/v1/images/stellar/prod/150831173342-cilic-face.jpg?q=w_2187,h_1458,x_0,y_0,c_fill/h_447)
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.
![Cilic stunned the tennis world when he triumphed in New York a year ago, ousting, among others, Roger Federer and Kei Nishikori.](https://media.cnn.com/api/v1/images/stellar/prod/141119160401-cilic-tease.jpg?q=w_2814,h_1876,x_0,y_0,c_fill/h_447)
Cilic stunned the tennis world when he triumphed in New York a year ago, ousting, among others, Roger Federer and Kei Nishikori.
![Novak Djokovic has won two of the three majors on the men's side this year to lift his grand slam tally to nine.](https://media.cnn.com/api/v1/images/stellar/prod/150831185846-djokovic-wins.jpg?q=w_3104,h_2256,x_0,y_0,c_fill/h_447)
Novak Djokovic has won two of the three majors on the men's side this year to lift his grand slam tally to nine.
![Djokovic, who owns one U.S. Open title, beat Andreas Seppi in straight sets to land in the fourth round.](https://media.cnn.com/api/v1/images/stellar/prod/150831185538-djokovic-forehand.jpg?q=w_2187,h_1458,x_0,y_0,c_fill/h_447)
Djokovic, who owns one U.S. Open title, beat Andreas Seppi in straight sets to land in the fourth round.
![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.](https://media.cnn.com/api/v1/images/stellar/prod/150831172128-paire-autograph.jpg?q=w_2187,h_1458,x_0,y_0,c_fill/h_447)
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.