Swansea boss Michael Laudrup blamed 'small details' for his side's 2-0 defeat at Aston Villa.
Matthew Lowton and Christian Benteke earned the home side their first Premier League win under Paul Lambert - and ended Swansea's unbeaten start to the campaign.
Full-back Lowton broke the deadlock with a fine first-half volley from the edge of the box and substitute Benteke wrapped up the points with two minutes left.
The side from South Wales created a number of opportunities themselves, but failed to capitalise on several gilt-edged chances.
"At this level, the small details tipped the balance from positive to negative," he told Sky Sports.
"I think today in the first half, we started quite well and we had a couple of big chances. One in particular from Nathan (Dyer) from the edge of the box, but it was a great save.
"And five minutes later they ended up scoring one of the goals of the day, so that's it. Maybe I think in the first half we gave the ball away a little bit too easily, but when we played fast we created some chances.
"We had another big opportunity through Danny Graham, so we had three or four big opportunities.
"For the last 20 minutes we had to risk a little more with four or five very offensive players on the field and obviously that gave some space behind and in the last couple of minutes they scored again.
"That's the small differences, that's what I have got to say."