We delved into the archive to find out. Follow every key moment of tonight’s cup tie on our live blog, at www.thestar.co.uk.
5. Dejection
Boro's injury time winner at the Riverside was credited as a Paddy Kenny own goal Photo: Mark Thompson
6. Halmosi the hero
A year on, United fell at the fifth-round hurdle once more... and again after a replay. This time, United were knocked out by Hull City 2-1 at the Kcom Stadium Photo: GRAHAM STUART
7. Sharp as a Blade
Billy Sharp got on the scoresheet in the second leg, but it wasn't enough as United went out of the cup Photo: Jamie McDonald
8. A winner!
At last... a fifth-round win! This one almost went to a replay, too, with the scores locked at 1-1 against Nottingham Forest in the 90th minute after Conor Coady equalised for the Blades Photo: PAUL ELLIS