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The 2011 men's final between Rafael Nadal and Novak Djokovic, despite lasting only four sets, became the fourth longest men's final in the US Open's storied history, lasting four hours, 10 minutes.
The match was memorable in part because Djokovic lost the first set to Nadal and was facing severe cramps in multiple parts of his body. And then the mojo shifted in his direction.
He battled through intense rallies and unimaginably long game points to outlast Nadal. More on the incredible match can be found here.
Interestingly enough, this match also brought about an odd angle. Both players complained about the stadium's lights. The fact this match was played at night was actually hurting the players.
The rematch of the 2010 final won by Nadal provided some revenge for Djokovic, and it put him on track for one of the greatest year long runs by any pro, ever.
Just another angle that made this a great match.
Each of these matches were memorable. There's little need to rank them. Let's just appreciate each one for the uniqueness and greatness it brought.