A last-gasp strike from Dani Ceballos capped a dramatic finale at Bramall Lane and propelled Arsenal into the semi-finals of the Emirates FA Cup.
Ceballos beat Dean Henderson from the near post after collecting a loose ball inside the box to deflate the hosts who looked at the point like they would take the game to extra-time.
Ivorian International, Nicolas Pepe had given Arsenal a first half lead against the run of play after converting a penalty given for a foul on Alex Lacazette as he received a pass from Kieran Tierney.
David McGoldrick equalised three minutes from time following a mixup in the Arsenal penalty area as the Gunners failed to clear a long throw-in and Sead Kolasinac’s attempt hit Shkodran Mustafi, gifting McGoldrick.
It looked like some justice for Sheffield United who had dominated the early exchanges and even had a John Lundstram goal disallowed by VAR