Patrick Bamford's strike was enough to help MK Dons secure their first win of the season against Crewe.
The on-loan Chelsea striker capped an impressive display when he tapped home a low Jason Banton cross, having earlier hit the crossbar.
Crewe were dominated in the first half but came alive in the closing stages as the Dons weathered a storm.
The best chance fell to George Ray, who placed his free header wide from Ajay Leitch-Smith's free kick.
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MK Dons manger Karl Robinson told BBC Three Counties:
"I thought that was a wonderful first half performance. Second half, I thought we had a 30 minute spell where we were poor, diabolical to an extent. Sloppy, lethagic and not like us.
"George [Baldock] played in the wide-right position - we took a chance on playing him because of his performance on Tuesday but he's proven it was a worthwhile decision for us.
"Second half, they showed their youthfulness in the final third, and rather than killing the game off in the first 15 minutes, we let them back into it.
"It's been a good week. Two wins and a draw. I don't think as a manager I can ask for too much more than that."