“We know what the derby means. We are not in a position to be bouncing about anything. We are moving forward,” Fernandes said.
City fans jeered at the final whistle as their once dominant team’s woeful run of form extended to one win and eight losses in 11 games.
"I'm the boss, I'm the manager and I'm not good enough. It's as simple as that," Guardiola said.
It was a first derby victory for new United head coach Ruben Amorim, who led Sporting Lisbon to a 4-1 win against City in one of his last games in charge of the Portuguese club in November.
But for a long time it looked like being a third-straight league loss for United after Josko Gvardiol’s headed goal in the 36th.
Fernandes was guilty of missing the target when through on goal in the second half and United struggled to create chances against a City team that rarely looked like adding to its lead.
But in a dramatic end to the match, Diallo raced after an underhit backpass from Matheus Nunes. Nunes then brought down the United forward in the box and referee Anthony Taylor pointed to the penalty spot.
Fernandes made no mistake this time — sending Ederson the wrong way.
Moments later, Diallo ran onto a long pass from Lisandro Martinez, flicked the ball high and past Ederson before rolling it into the net from a tight angle.
United is 13th and five points behind fifth-place City.
Chelsea, in second, closed the gap to Liverpool to two points after a 2-1 win against Brentford. Tottenham thrashed last-place Southampton 5-0 with all the goals in the first half.
Sarr double
Ismaila Sarr scored twice as Crystal Palace beat Brighton 3-1 in the Premier League on Sunday.
The forward also provided an assist for Trevoh Chalobah in the win at the Amex Stadium, which lifted Palace four points clear of the relegation zone.
Brighton is ninth and without a win in four matches.
Palace went ahead in the 27th minute through Chalobah, and Sarr doubled the lead for the visitors in the 33rd.
Sarr scored his second in the 82nd before Marc Guehi’s own-goal pulled one back for Brighton. It was Guehi’s second own-goal in his last four games.
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James Robson is at https://twitter.com/jamesalanrobson
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AP soccer: https://apnews.com/hub/soccer
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