Wimbledon 2015: Can Serena Williams win a sixth title?

Former world number one Tracy Austin discusses Serena Williams' strengths and weaknesses, and whether she is likely to win her sixth title.

The top seed plays Britain's Heather Watson in the third match on centre court on Friday, with the action likely to start at around 17:00 BST.

Follow live video and text coverage of day five at Wimbledon here.

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