MK Dons manager Karl Robinson admitted the penalty decision that led to Shaun Williams' last-minute winner against Sheffield United was "baffling".
Williams coolly stroked home his spot-kick after Blades substitute Darryl Westlake was harshly adjudged to have fouled Angelo Balanta, ending the Blades' unbeaten start to the npower League One season.
Robinson, whose side extended their winning run to three games, said: "I thought we deserved it, I thought we were in control for all the game. There were one or two flashpoints obviously, which will be the talking points, but I thought over 90 minutes that our attitude, our endeavour, our football and our defending were brilliant.
"It was almost the complete performance in my view - that's as good as you're going to get.
"I didn't think the penalty in the second half was a penalty that he did give - I find it baffling how he did give it. But the one in the first half when Dean Bowditch was in on goal and he was brought down and he was in control of the ball - it should have been a penalty and sending off after 30 minutes.
"We would have been 1-0 up with an hour left of the game, then maybe it would have been a bit of an easier second half for us to endure. But he got the biggest one wrong."
The Blades rarely threatened but it looked like they would hang on for a fifth successive clean sheet until Williams' late penalty settled matters. Visiting boss Danny Wilson felt it was a harsh decision against his team.
"He was going out of the box and the boy falls down - in fact, it could have been a booking in regards to the winger," he said. "But we have to live by it. You're not going to get much solace from me this evening because I'm absolutely furious.
"This is what really frustrates us, because those lads in there didn't deserve that decision at the end. They've worked their tail off - they've been well-organised, disciplined, effective in lots of key areas to negate a lot of the play that MK Dons have and we've caused a few problems ourselves.
"To come away with nothing to show for that, down to one individual, I find it really frustrating on the players' part."