The World No. 2 criticized the use of Head tennis balls after his second round win.
Andy Murray was forced to improvise with a bizarre shot in his third round match at Beijing.
The Uzbek pulled off one of the shots of the year on match point.
The Ukrainian was displeased with the decision to move Ukraine's tie with Belgium to neutral ground.
Chinese pioneer took part in an emotional farewell ceremony in Beijing.
The Brit, who retired earlier this month, takes on a leadership role in the ATP.
Last week's title winners weren't the big movers in the rankings.
