Chelsea came from behind three times against Manchester United yesterday before a nine-goal thriller was settled by Ramires' extra-time shot clinching a 5-4 victory and a spot in the League Cup quarter-finals.
Three days after losing an acrimonious Premier League encounter to United, Chelsea were heading out of the tournament until Eden Hazard scored from the penalty spot in 90th minute to make it 3-3.
In extra time at Stamford Bridge, Daniel Sturridge and Ramires gave Chelsea an apparently comfortable lead - until Ryan Giggs scored his second of the night for United, and the game's third penalty, in the 120th minute.
Chelsea will now travel to Leeds in the quarter-finals.
Also yesterday, Liverpool's title defence ended when manager Brendan Rodgers' former club Swansea won 3-1 at Anfield to set up a last-eight match against Middlesbrough.