Wayne Rooney ended a tortuous week by scoring, but David de Gea proved to be Manchester United's hero for saving their FA Cup skins after Sir Alex Ferguson's team threw away a two-goal lead in their quarter-final with Chelsea.
Second-half goals from Eden Hazard and Ramires earned the visitors a 2-2 draw after Javier Hernandez and Rooney had struck early.
It seemed certain Juan Mata would complete a memorable comeback when he stepped inside Jonny Evans in the final minute.
But De Gea, so often the target of criticism, stuck out a leg to keep Mata out and United in the tournament.
The replay will not suit Ferguson, still less so Rafael Benitez given it could potentially force Chelsea into four games in a week or trigger the postponement of a Premier League fixture.
However, both have reason to be thankful, United because their collapse from a position of such immense promise could so easily have been total, Chelsea as at half-time it seemed Benitez was being given another hefty s...