Town played well at Sixfields but were undone by Anthony Hartigan's long-range strike. Here are our player ratings...
5. Joseph Mills
Read the danger smartly in one first-half incident as Dons threatened to counter, and came into the contest as an attacking force after the break. One low cross was put into a good area but no forward player gambled on it... 7
6. Paul Lewis
Drifted in and out of the game, did some good things but never really imposed himself on the contest. Just couldn't quite do enough to prevent Wimbledon's breakaway for the winner... 6
7. Jordan Flores
As bright as he's looked in claret so far. Good on the ball with some nice passing through the lines and combative off it, not afraid to stick a boot in when required... 7
8. Dylan Connolly
Squandered perhaps the best chance of the night, even if he did look suspiciously offside, but was a bright spot for Cobblers on the right wing, though his end product was erratic... 6.5