Manchester United versus Chelsea is a clash which has become one of the biggest in recent history in the Premier League. With so much usually at stake, it is hard to believe the difference between the two clubs this season.
Yet, in the FA Cup, reputation counts for nothing. Performance on the day is key to winning the tie, and that is what makes it such a special competition—one where even a non-league side such as Luton Town can beat Premier League outfit Norwich City at their own stadium.
And perhaps that is something that will give Chelsea the upper hand in their clash against Manchester United at Old Trafford, though the Blues are struggling under interim manager Rafa Benitez.
Chelsea are on an incredible run in the FA Cup; they are currently unbeaten in their last 27 games in the competition (excluding penalty shootouts), a streak which stretches all the way back to 2008.
However, the only thing worse than facing an in-form Manchester United side is coming up against a Manchester United team hungry to make amends.
They succumbed to a controversial 2-1 defeat against Real Madrid after Nani was sent off, with former Red Devils star Cristiano Ronaldo coming back to haunt his former club as he scored the winner to send them out of the Champions League.
Now, Sir Alex Ferguson will be keen to put that result in the distant memories and book their place in the FA Cup semifinal.
It promises to be a superb game of football whatever the result.