Pundits' picks: Men's semi-finals preview

BBC pundit John Lloyd picks his winners ahead of the eleventh day of play at Wimbledon 2013.

Juan Martin Del Potro, who battled through injury to beat David Ferrer, takes on world number one Novak Djokovic in the last four on Friday.

Meanwhile, Andy Murray will hope to match last year's achievement of making it to the Wimbledon final when he takes on number 24 seed Jerzy Janowicz in the second semi-final.

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