Rafael Nadal withdrew from the Miami Masters prior to his scheduled semi-final against Andy Murray on Friday with a knee injury, the ATP tour said via Twitter.
"Rafael Nadal has been forced to withdraw from today's match at the SE Open due to a knee injury," a posting on the ATP's Twitter feed said.
"Andy Murray advances to the final."
Later Friday, world number one Novak Djokovic was to face Juan Monaco for a place in the final.
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