Novak Djokovic's frustration with the controversial blue clay at the Madrid Masters reached new heights after the world number one was beaten 7-6 6-3 by fellow Serb Janko Tipsarevic in the quarter-finals on Friday.
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Serena Williams blew away fellow former number one Maria Sharapova 6-1 6-3 to join top seed Victoria Azarenka in the semifinals at the Madrid Open on Friday.
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Rafa Nadal suffered his first clay court defeat in 23 matches on Thursday and threatened to boycott next year's Madrid Open if officials did not ditch the blue clay that players have labelled "too slippery" and only fit for "smurfs (to) play on".
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