Peterborough came back from a goal down to beat Crystal Palace.
The home side went behind when the ball broke to Sean Scannell in the Posh area and he cleverly flicked the ball over keeper Paul Jones for the opener.
Peterborough increased the pressure for an equaliser after the break and were rewarded when Grant McCann drilled in a first-time shot low into the corner.
David Ball came off the bench to grab the winner when he nodded in a Mark Little cross.
Palace narrowly escaped relegation last season and their capitulation will prove a worry for manager Dougie Freedman.
The Eagles started promisingly enough and almost scored straight from the kick-off when a shot from winger Scannell was forced around the post by keeper Jones.
McCann responded for Peterborough and his long range shot was tipped over the bar by Julian Speroni before Scannell gave Palace the lead.
Defender Peter Ramage kept the visitors ahead when he blocked a fierce drive from Ball on the goal-line but Palace failed to keep their hosts at bay for much longer.
Lee Tomlin played a free-kick into the path of McCann and he powered in a shot before Ball added a second for Posh to secure victory.
Peterborough United 28 Jones 02 Little 03 Basey 04 Bennett 05 Zakuani 11 McCann 14 Rowe 23 Frecklington (Tunnicliffe - 87' ) 07 Ajose (Ball - 27' ) 08 Tomlin 10 Boyd Substitutes 13 Day 06 Wootton 27 Alcock 16 Tunnicliffe 09 Ball Crystal Palace 01 Speroni 03 Wright 05 McCarthy Booked 35 Davies 36 McGivern (Garvan - 79' ) 38 Ramage Booked 04 Parr 07 Ambrose 08 Dikgacoi Booked 11 Scannell (Zaha - 70' ) 17 Murray Booked (Easter - 77' ) Substitutes 34 Price 37 Punchev 10 Garvan 16 Zaha 19 Easter