Victory saw Manuel Pellegrini's side close to within six points of leaders Liverpool with a game in hand.

Third-placed City -- who after Monday's match have four league games remaining this season compared to Liverpool's three -- were 2-0 up inside 10 minutes thanks to goals from Pablo Zabaleta and Sergio Aguero.

However, the Baggies -- still only three points above the relegation zone -- pulled one back through Graham Dorrans.

But City defender Martin Demichelis restored City's two-goal lead before the interval when he turned in a 36th minute corner.

League Cup winners City continue their title bid away to in-form Crystal Palace on Sunday.