Day four preview: 'Murray to shine'

Former British number one Sam Smith predicts that match favourites Andy Murray, Rafael Nadal and Petra Kvitova will all prevail on day four at Wimbledon.

Murray faces Ivo Karlovic on Centre Court, followed by Nadal against Lukas Rosol, while defending women's champion Kvitova faces Britain's Elena Baltacha on Court One.

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