Practice makes them perfect

Russia's Maria Sharapova warms up during a training session at Wimbledon

Serbia's Ana Ivanovic during a training session at Wimbledon.

Britain's Laura Robson serves during a training session at Wimbledon.

Switzerland's Roger Federer practices during a training session at Wimbledon.

American Venus Williams, a five-time champion at the All England club, leaves following a training session at Wimbledon. 

Britain's Andy Murray arrives for a training session at Wimbledon. 

Serena Williams of the US in action as she trains at Wimbledon.