Top seed John Isner downed defending champion Kevin Anderson 6-2, 7-6 in a battle of tennis giants to march into the semi-finals of the Delray Beach International on Friday.
Defending champion Xavier Malisse set up a quarter-final showdown against Russian fourth seed Mikhail Youzhny after overcoming Jurgen Melzer in the second round at the Chennai Open on Wednesday.
India's Rohan Bopanna joined forces with Marcin Matkowski to reach the doubles semi-finals of the Dubai Duty Free Tennis Championships.
India's Sania Mirza and Croatia's Ivan Dodig moved into the semi-finals of the mixed doubles at the French Open beating Yung-Jan Chan/Max Mirnyi.
Roger Federer took a big step towards securing his endangered place in the ATP World Tour Finals by overcoming rising Canadian talent Vasek Pospisil 6-3, 6-7(3), 7-5 in the Basel Open semi-finals on Saturday.
Roger Federer ended Grigor Dimitrov's seven-match winning streak and showed the Bulgarian he has some way to go to live up to his 'Baby Federer' tag with a 6-3 7-6 (2) quarter-final victory at the Basel Open on Friday.