Fleet-footed Wu pushes Rafa to the limit

Rafael Nadal was broken four times by one of his former ball boys before he struggled into the second round of the China Open in an unconvincing return to action on Tuesday.

The Spanish star ultimately won 6-4, 6-4 - but not before he trailed in the second set against China's 230th-ranked Wu Di, who once tossed him balls and towels in Shanghai.

Nadal, 29, was playing for the first time since his third-round loss at the US Open, but it was far from a satisfying return as the 14-time Grand Slam champion continued to scratch around for form.