By FOX SPORTS staff
Fans of the Red Devils were given a fresh reminder of Aguero's abilities as he came off the bench to decide the last Manchester derby of the season and hand Sir Alex Ferguson's team their first defeat in 18 games.
James Milner seized the initiative for City early in the second half, but an own goal from his captain Vincent Kompany levelled matters at Old Trafford. As such, it fell to a piece of Aguero brilliance to win the game for Roberto Mancini's squad.
David De Gea - 6.5
There was very little that De Gea could do regarding both the goals he conceded. Milner's effort took a slight deflection off Jones to wrong-foot the United goalkeeper, while De Gea was practically left for dead by his defenders when it came to Aguero's winner.
Rafael - 6.5
Certainly not a defender that would shy away from taking part in attacks, Rafael stormed up and down the right flank with purpose for the Red Devils. Although he found it tough to beat the pace of Gael Clichy, Rafael made his presence felt to the Frenchman, all while juggling his own defensive duties.
Rio Ferdinand - 6.0
As the most experienced member of the United defence, Ferdinand kept his team's back four organized over the course of the game. However, he was guilty of dropping too deep during certain instances, freeing up space in front of the penalty area for the City midfielders to play.
Phil Jones - 6.5
The young Englishman was one of the Red Devils' standout performers, throwing his body on the line while carrying out his defensive responsibilities and popping up to force his team's goal. Nonetheless, Jones could have done slightly better against Aguero in the run-up to City's winner as he seemed to allow the Argentinean to skip past him easily.
Patrice Evra - 5.5
It was quiet outing for Evra, who spent most of his time at the back keeping watch on Milner. The former Monaco man was hardly ever seen on the overlap, a move which could have been useful during United's pursuit of an equalizer.
Ashley Young (off 92') - 6.5
Always ready and eager to take on his man, Young saw plenty of the ball on his flank, but failed to do anything of note with it. The United man found himself at the heart of several of his team's attacks and should have come up with better deliveries.
Michael Carrick - 5.5
Tasked with protecting the back four at all costs, Carrick was not given the freedom to venture forward in support of his attackers. The Red Devils sorely lacked his metronomic passing skills, as he struggled to influence the game from deep inside his own half.
Ryan Giggs - 5.5
The veteran player saw plenty of possession and had a hand in the initiation of several united attacks. However, most would likely remember his silly back-flick in the run-up to City's first goal.
Danny Welbeck (off 80') - 5.5
After an encouraging start that saw Welbeck involved in a few counter-attacks, the United forward faded away when his team needed him most. Welbeck also demonstrated a poor first touch in crucial attacking positions, Ferguson's men an opening at goal.
Wayne Rooney (off 85') - 4.5
The England international threatened City in the first half by passing some incisive balls during counter-attacks, but failed to actually take a shot at Joe Hart's goal. He saw even less possession in the second period and will likely be very disappointed with his performance in this game.
Robin van Persie - 6.5
Tightly marked by Kompany and Matija Nastasic, van Persie was hardly ever given time on the ball in the City penalty area. Nevertheless, the Dutchman managed to chalk up an assist with a superb delivery from a free kick in the lead up to his team's goal.
Antonio Valencia (on 80') - 6.0
Javier Hernandez (on 85') - 6.0
Shinji Kagawa (on 92') - 6.0
Joe Hart - 6.0
With his team in the ascendency for most of the game, Hart had very little to do in this one. He would not have to shoulder much blame for the goal conceded either, as the pace and swerve of van Persie's delivery would have beaten most goalkeepers.
Pablo Zabaleta - 6.0
Like his opposite number, Zabaleta also turned in a quiet outing. With most of the Red Devils' attacks taking place on the other flank, the Argentinean was hardly ever stretched defensively and managed to move up in support of his team's attackers from time to time.
Vincent Kompany - 6.5
Although the Belgian will not be pleased to have given away an own goal, the outing against their arch rivals should be chalked up to yet another defensively sound performance from Kompany. The City captain was did a splendid job of keeping van Persie off the ball and stepping the way of any counter attack that came his way.
Matija Nastasic - 6.0
Working with Kompany well, Nastasic played his part in silencing the United strike-force. Although the former Fiorentina man is hardly ever in the spotlight, his performance tonight proved that he should be considered one of the team's unsung heroes.
Gael Clichy - 7.0
The Frenchman was involved in every attack that stemmed from the left, as he moved up quickly to support compatriot Samir Nasri whenever the ball came in their direction. Capping off a fine attacking display with some sound defensive work, Clichy kept track of Welbeck and ensured that the United academy graduate's influence on the game diminished as time wore on.
Gareth Barry - 6.0
With the Red Devils opting to sit deep in their own half and break on the counter, Barry ventured higher up the pitch more often than he would have in other games. The Englishman kept his passing simple and always made sure he was available to support team-mates in a tight squeeze.
Yaya Toure - 7.5
Starting alongside Barry in defensive midfield, Toure was an added security measure for City when it came to dealing with van Persie and Rooney. The United striking duo found Toure a nuisance to deal with and the Ivorian also managed to slide in the pass that led to Aguero's winner.
James Milner - 7.0
The Englishman can always be relied upon to turn in an industrious display and his latest performance against United was no different. After scoring City's opener, Milner's influence on the game diminished slightly, but Mancini is unlikely to mind given the result.
David Silva - 7.0
Despite being one of the most diminutive players on the pitch, Silva challenged the likes of Ferdinand and Jones for every delivery that came into the penalty area. The Spaniard was also dangerous on the dribble and looked likely to carve open the Red Devils defence whenever he got on the ball.
Samir Nasri (off 71') - 6.0
There was plenty of probing and teasing from Nasri, but very little end product. Nevertheless, Mancini will acknowledge that the Frenchman was involved in most of his team's attacks.
Carlos Tevez - 5.0
Deprived of the support of Edin Dzeko, Tevez struggled to win the aerial duels he contested against the United defence. Thankfully for the Argentinean, his compatriot Aguero came on to score the vital winner, which eased the pressure off him.
Sergio Aguero (on 71') - 8.0
The former Atletico Madrid man's energy sparked the City attack to life immediately upon coming on. It was hardly surprising when he tore through the Red Devils defence to score his team's winner.
Joleon Lescott (on 90') - 6.0
Javi Garcia (on 94') - 6.0