MK Dons eased into the second round of the Carling Cup with a comfortable win at Cheltenham.
The hosts took the lead when Luke Summerfield's shot from the edge of the box deflected past David Martin.
But the Dons equalised when Sam Baldock converted Angelo Balanta's pass from six yards before Jabo Ibehre fired them ahead from 12 yards.
Dean Lewington headed in the third from Balanta's corner, with the Colombian nodding in Ibehre's cross to seal it.
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Cheltenham Town manager Mark Yates told BBC Gloucestershire:
"When you play decent teams that's what happens sometimes.
"We had them by the throat and we didn't score a couple of goals we should have scored and the equaliser deflated us.
"For large periods of the game we more than matched them but we got taught a lesson in how to be clinical."
MK Dons manager Karl Robinson told BBC Three Counties Radio:
"When the boys went in to overdrive they were different class.
"That's the frustrating but the good thing, as I know they got it but I want to see it more.
"Tonight just showed the strengths and weaknesses of us, how good we can be and how bad we can be, and yet we've come away with a 4-1 result."