Dominic Green came off the bench to score the winner as Peterborough came from behind to see off rivals MK Dons.

The home side took the lead with half an hour left when Canada's Ali Gerba marked his home debut with a fine goal.

Craig Mackail-Smith's controversial penalty equalised for the visitors after Miguel Llera handled in the box while Willy Gueret lay injured.

Just four minutes later Green beat Gueret with a well-drilled shot to secure the points for Peterborough.

Milton Keynes Dons: Gueret, Regan, Llera, O'Hanlon, Lewington, Wright, Navarro, Leven, Cummings, Gerba, Wilbraham (Baldock 38).

Subs Not Used: Abbey, Stirling, Johnson, Belson.

Booked: Llera, Gueret, Lewington.

Goals: Gerba 63.

Peterborough: Lewis, Martin, Morgan, Zakuani (Westwood 22), Williams, Whelpdale (Green 67), Coutts, Hyde, Boyd, Mackail-Smith, Batt (Lee 90).

Subs Not Used: Tyler, Rendell.

Booked: Hyde.

Goals: Mackail-Smith 73 pen, Green 75.

Att: 10,876

Ref: Phil Dowd (Staffordshire).