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LONDON, ENGLAND - APRIL 16: Rio Ferdinand of Manchester United and Roberto Mancini of Manchester City intervene as Anderson of Manchester United clashes with Mario Balotelli of Manchester City after final whistle of the FA Cup sponsored by E.on Semi-Final match between Manchester United and Manchester City at Wembley Stadium on April 16, 2011 in London, England. (Photo by Matthew Peters/Manchester United via Getty Images)

LONDON, ENGLAND - APRIL 16:  Rio Ferdinand of Manchester United and Roberto Mancini of Manchester City intervene as Anderson of Manchester United clashes with Mario Balotelli of Manchester City after final whistle of the FA Cup sponsored by E.on Semi-Final match between Manchester United and Manchester City at Wembley Stadium on April 16, 2011 in London, England.  (Photo by Matthew Peters/Manchester United via Getty Images)