Murray worried by ‘slippy’ Wimbledon surface after Serena Williams injury

• Retirements in back-to-back matches raise concerns
• It's extremely slippy out there,' says Murray

Andy Murray has joined a chorus of players raising concerns about Wimbledon's Centre Court surface being too slippery after Serena Williams was forced to retire during her first-round match.

Williams, a 23-time grand slam champion, appeared to twist her ankle in the fifth game of her match against the Belarusian world No 100, Aliaksandra Sasnovich, and was forced to withdraw a game later after her body buckled as she tried to return a serve.