MAN CITY 4 (Yaya Toure 5, Aguero 15, 74, Tevez 52), LEEDS 0
Man City: Pantilimon, Zabaleta, Nastasic, Kolo Toure, Kolarov, Yaya Toure, Garcia (Rodwell 60), Milner, Tevez (Maicon 64), Silva, Aguero (Dzeko 81). Subs: Hart, Lescott, Clichy, Nasri.
Leeds: Ashdown, Byram, Peltier, Lees, Warnock, White, Brown (Norris 46), Austin (Tonge 77), Varney, Diouf, McCormack (Morison 46). Subs: Kenny, Pearce, Hall, Habibou.
Referee: M Clattenburg
Att: 46,849 (6,100 Leeds)
Leeds United manager Neil Warnock went into the FA Cup fifth round match having made four changes to the team that started at Middlesbrough in midweek. Paddy Kenny was replaced by Jamie Ashdown, as with previous cup matches, midfield duo Rudy Austin and Aidy White were handed starts with David Norris dropping to the bench and the injured Paul Green not making the trip. Steve Morison also made way for El-Hadji Diouf in the attack.
The game started at a fast pace and City were nearly in on goal when Sergio Aguero almost latched onto a backpass.
And the home side went ahead in the fifth minute of the match when Yaya Toure barged his way through on the United goal, before rounding Ashdown to put the ball into the empty net.
When City threatened again, Aguero got on the end of a long ball, but the Argentinean was crowded out. The hosts were applying the pressure and Stephen Warnock and Lee Peltier combined to make a vital block.
The City pressure continued, Aguero got onto the end of another long ball then passed into the path of Carlos Tevez who shot into the side netting.
Aguero caused United major trouble during the opening 15 minutes and won a penalty when Tom Lees was seen to be pulling him back. Aguero took the spot-kick himself and placed it in the top left-hand corner of Ashdown's net.
It took United the best part of half an hour to enjoy any real possession and White almost fashioned an opportunity for Lees, but the centre-back couldn't quite make a telling connection.
Just before the 30 minute mark the United goal was under threat again when Aleksandar Kolarov's free-kick was turned just wide by Matija Nastastic.
City continued their dominance in the match and Yaya Toure almost got his second of the game when he shot from distance but Ashdown pulled off a great save to tip over.
Just before the half-time interval United had their first attempt on target when Ross McCormack struck a free-kick goalwards which Costel Pantilimon saved.
Warnock made two changes at the break, bringing Norris and Morison on for Michael Brown and McCormack.
It didn't take City long to get back into the swing of things and in the 52nd minute Aguero showed great skill to work his way through the Leeds defence to tee up Tevez with an easy finish.
The third goal effectively ended the tie as a contest and United were playing for pride during the final 30 minutes. United substitute Norris tried his luck from distance but the shot went well over the City goal.
The United goal lived a charmed life in the 65th minute when Ashdown pulled off a great save to deny Yaya Toure, then City replacement Jack Rodwell headed the ball against the bar.
It was United's turn to have an opportunity on 70 minutes when White crossed for Luke Varney but his header went over Pantilimon's crossbar.
And City made it 4-0 in the 74th minute when Aguero beat the off-side trap to latch onto a David Silva cross to finish.
With five minutes remaining some lapse United defending allowed City substitute Edin Dzeko to have a strike at goal, but Ashdown was up to the challenge and saved his effort.
Dzeko's effort proved to be the last meaningful action of the game as United exited the FA Cup.