Alexis Sanchez's scrambled extra-time winner secured Arsenal an FA Cup final date with Chelsea - and ensured Manchester City manager Pep Guardiola will end a season without a trophy for the first time in his coaching career.
Arsenal kept alive their hopes of finishing in the top four of the Premier League with a narrow victory at second-bottom Middlesbrough.
Arsenal avoided an FA Cup giant-killing and spared manager Arsene Wenger further pressure with a hard-fought fifth-round victory over non-league Sutton United at Gander Green Lane.
Arsenal manager Arsene Wenger says "he would cry" if the Premier League introduced a festive break.
Chelsea manager Jose Mourinho has appeared to criticise Arsenal counterpart Arsene Wenger, "the king" who is "not under pressure".