Real Madrid v Manchester United
In probably the most delicious matchup, Cristiano Ronaldo will return to Old Trafford for the first time since leaving for a world record £80 million in 2009. United secretary John Alexander said, "It's the game that everybody wanted to see but nobody wanted to see." No doubt a difficult assignment for the Red Devils.
The sides last met in 2003, when a famous hat-trick in Manchester by Ronaldo -- Cristiano Ronaldo's Brazilian predecessor and namesake -- gave Madrid a 6-5 aggregate quarter-final win.
Madrid coach Jose Mourinho has only lost two of his 14 previous encounters with United but Alex Ferguson said he was looking forward to resuming hostilities with his old sparring partner.
"Well, it's the tie of the round," the United manager told the club website.
"It's a great opportunity for our fans to see Cristiano again and also for me to meet up with Jose again -- I'll need to order some good wine!"
Former Madrid player and club director Emilio Butragueno said: "I'm sure it's going to be a special game for Ronaldo.
"He's a great professional so I'm sure he's going to do his best to help Real Madrid qualify for the next round, but going back there will be special for him."
What are the other ties? Click on.