Even by the rarified atmosphere of Manchester derbies, there will seldom have been so much on the line for both sides of the city when Manchester United host Manchester City on Wednesday.
For City, the Premier League title is at stake with Pep Guardiola's men needing to win their remaining four matches to be sure of becoming the first side since United a decade ago to retain the title.
Those days of dominance are long gone for the Red Devils with just a place in the top four and Champions League qualification their target.
However, United also have to restore some sense of pride after a 4-0 thrashing at Everton on Sunday.
Defeat at Goodison Park was United's sixth in eighth games, a run that has seen them crash out of the Champions League and FA Cup, as well as slip back down to sixth in the Premier League.
But with Tottenham, Arsenal and Chelsea also faltering, they remain just three points off the top four.
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The momentum and feel good factor built up by Ole Gunnar Solskjaer's first few months in charge has gone.
Now the Norwegian, only hired on a permanent basis last month, has to show he has the ability to arrest the slump even before a major restructure of his squad takes place in the summer.
Solskjaer questioned the work rate and desire of some of his players on Sunday, making it clear that big changes are needed.
However, he is clinging to the hope that those he currently has to call on will be shocked into a short-term response.
"Against City at Old Trafford on Wednesday, that's the biggest incentive we can have," said Solskjaer after the Everton embarrassment.
"Old Trafford at home, in front of our fantastic fans, they were unbelievable again and they never ever moaned at our players, which they could have, but they've been supportive and I'm sure they will be on Wednesday night."
"I have good players, but they have to do it. And when people expect them to do it, it's harder to do it. That's why we push them but they respond really well. I love my team."