What to watch for

Last year's Wimbledon was the most unpredictable in memory.

Roger Federer, Rafael Nadal and Maria Sharapova - owners of a combined 10 titles at the All England Club - were all gone by the end of the second round. Five-time champion Serena Williams left in the fourth. Add in the record-equaling withdrawals or mid-match retirements because of health problems.

And to cap it all, Andy Murray finally gave Britain the men's champion it had wanted for more than three quarters of a century.