Djokovic played down his latest injury worry after making it through to the fourth round of the Australian Open.

World number one Novak Djokovic got the job done with the minimum of fuss on Centre Court today as he kicked off his Wimbledon championship with a straight-sets win over Florian Mayer.

Venus Williams marked her return to competitive action for the first time in over six months with a straight-sets win over Kimiko Date-Krumm in the first round of the Sony Ericsson Open in Miami.

Rafael Nadal and Roger Federer enjoyed straightforward victories at the ATP & WTA BNP Paribas Open on Sunday but Wimbledon champion Petra Kvitova suffered a surprise early exit in Indian Wells.

Andy Roddick had to come from behind to get through his second-round match at the SAP Open in San Jose.