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In a competition famed for giant killings and upsets, it's rare to reach the FA Cup semifinal stage and find four genuinely top sides remaining in the hunt.
Chelsea, Tottenham, Manchester City and Arsenal represent four of the Premier League's top six, and Saturday's semifinal is a meeting between the top two. Chelsea and Tottenham are England's best two sides this season, and their meeting will be a fascinating battle of tactics and technique.
These two have emerged as outstanding sides primarily because of their system as much as their individuals; you think of Chelsea and consider their 3-4-3 system, you think of Tottenham and consider their aggressive pressing.