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MANCHESTER, ENGLAND - MARCH 09: Nacho Monreal (L) of Arsenal celebrates after scoring the opening goal with teammate Alex Oxlade-Chamberlain of Arsenal during the FA Cup Quarter Final match between Manchester United and Arsenal at Old Trafford on March 9, 2015 in Manchester, England. (Photo by Michael Regan/Getty Images)

MANCHESTER, ENGLAND - MARCH 09:  Nacho Monreal (L) of Arsenal celebrates after scoring the opening goal with teammate Alex Oxlade-Chamberlain of Arsenal during the FA Cup Quarter Final match between Manchester United and Arsenal at Old Trafford on March 9, 2015 in Manchester, England.  (Photo by Michael Regan/Getty Images)