Gallery: Champions League Round of 16

Manchester United vs. Real Madrid

The round of 16's best tie features two of the world's best scorers in Cristiano Ronaldo and Robin van Persie. But even more monumental than the scoring will be Ronaldo's can't-miss return to Old Trafford on March 5, the first since leaving England in 2009.

The Red Devils were able to come out on top of Group H, while Real Madrid, despite their troubles in Spain, came in second in the “group of death” behind Dortmund.