Wimbledon, day eight

The shadow of Venus Williams, captured mid-serve during her defeat of Tamarine Tanasugarn on Court One Photograph: Tom Jenkins/Guardian

Tanasugarn throws her hat into the crowd after her defeat Photograph: Tom Jenkins/Guardian

Marcus Willis, the British junior player, during his victory in the Boys Singles on Court 14 Photograph: Tom Jenkins/Guardian

Martina Navratilova tries a volley in her ladies invitation doubles match with Helena Sukova on Court One Photograph: Tom Jenkins/Guardian

Andy Murray feels the strain as he warms up for a practice session Photograph: Tom Jenkins/Guardian

Murray knocks the ball about on the courts at Aorangi Park in preparation for his quarter-final with Rafael Nadal Photograph: Tom Jenkins/Guardian

Serena Williams returns serve to Polish teenager Agnieszka Radwanska Photograph: Guardian

Jie Zheng was made to work for her victory over 18th seed Nicole Vaidisova on Court One Photograph: Guardian

Serena Williams celebrates a straight sets victory which puts her into the semi-finals where she will play Chinese wildcard Jie Zheng Photograph: Guardian