Manchester City were unable to make use of their dominance and prevail over local neighbours, Manchester United - in a Manchester derby which promised much but for the home supporters, delivered little. Instead of tightening their grip on the top-four, the Citizens' defensive frailties have been exposed and their big-game vulnerability has come into question once more, having lost to a less-than-perfect Louis van Gaal side on Sunday.
How did the players fare individually? Read below, for the hosts' player ratings:
An unfortunate goalkeeper, unstable backline
Joe Hart: 7/10. Made an important save, was unfortunate to concede Rashford's opener, and was brave to deal with a poor backpass in his area - getting injured in the process. Can only hope for a swift recovery.
Bacary Sagna: 6.5/10. Did well to cope with the electric pace and agility shown by Martial on the flank, but wasn't given the attacking freedom he normally enjoys.
Eliaquim Mangala: 7/10. Was far superior to his centre-back partner on a troublesome afternoon - with United's attacking trio looking to exploit the hosts' defensive frailties. The Frenchman, who has come under plenty of criticism in recent months, was solid and a reliable figure at the back helping to protect Hart whenever United went on the counter-attack.
Martin Demichelis: 4/10. A forgettable first-half for the Argentine saw him sacrificed shortly after Hart's injury, and plenty of supporters have already branded his performance one of the worst defensive displays in recent seasons. Not particularly good to see considering, he's out of contract this summer..
Gäel Clichy: 6.5/10. Just like Sagna, was defensively solid but counted for nothing ultimately as the Citizens struggled to make the most of their chances in the final third. Was understandably tentative to get forward at times, protecting the unstable centre-back partnership alongside him.
Un-inspiring midfield pack
Fernandinho: 6/10. Was unable to sufficiently stamp his authority on the game in midfield, partly through having to take a back seat with the marauding Touré driving forward constantly. Patient in possession but unfortunately, with no reward this time.
Yaya Touré: 6.5/10. Tried to make things happen, but struggled to force much in-front of goal. Was energetic and powerful though, which was encouraging especially considering his head often drops after an early setback.
Jesús Navas: 7/10. One of his best and most effective performances in a while, the experienced Spaniard was industrious both defensively out-of-possession and a handful for Darmian to contend with on the flank.
Raheem Sterling: N/A - Unfortunate to sustain an injury early on in a game after a late sliding challenge from Mata - where he looked energetic and threatening on the left-hand side. Can only hope his groin injury is not too serious.
David Silva: 6.5/10. Was unable to sustain the consistently high level of performance supporters are used to seeing throughout, but displayed moments of magic - that Aguero was unfortunate not to profit from.
A forlorn, frustrated figure up-top
Sergio Agüero: 6/10. It was evidently clear he tried, but ultimately to no avail. Missed a handful of promising opportunities, despite having Smalling under control for large parts of the action. Unfortunate not to have scored at least one, as his goalless run continues.
Fernando: 6/10. Came on to help solidify the midfield after Sterling's injury midway through the first-half, and did so - rather unspectacularly though.
Willy Caballero: 6.5/10. Was forced into the thick of things after Hart's injury, and dealt with danger particularly well in the first ten minutes after being introduced. Made one or two good saves, otherwise solid from the Citizens' cup shootout hero.
Wilfried Bony: 6/10. Was brought on as a second-half alteration with the team in search of a much-needed equaliser. Was heavily present in the air but didn't see enough of the ball to warrant many chances, although he was unfortunate not to test de Gea after a last-ditch challenge by Michael Carrick in the area.