It's something of a tradition for Arsenal's campaign to disintegrate in the space of a midwinter fortnight, and recent history is damning: Mikel Arteta's men have failed to get past the FA Cup 3rd round in two of the past three seasons. While you never know what you're going to get from Man Utd from one game to the next, the FA Cup holders know that their opponents are there for the taking today.
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