Matt Smart's winner dealt a severe blow to Wrexham's Blue Square Premier play-off push as Eastbourne Borough snatched a late 1-0 win at Priory Lane.
The Eastbourne midfielder pounced from point-blank range with five minutes remaining to bundle home after keeper Gavin Ward's save from Daniel Brown.
Sam Aiston and Wes Baynes went close for the visitors, Dean Saunders' men having won now just once in six games.
Wrexham move further adrift, now seven points behind the play-off zone.
Eastbourne assistant manager Nick Greenwood:
"It was a great day and an unexpected point.
"It was one of those games where we don't put ourselves under any pressure, we just concentrate on the sides at the bottom so picking up the points against a side like Wrexham, it has been a great day.
"We've learned to play against the bigger sides in this division."
Wrexham manager Dean Saunders:
"I was really disappointed with our performance, we coasted through the game and didn't look in any trouble and let them off the hook by putting them to bed.
"We were not creating clear-cut chances but we had most of the ball and played most of the game in their half and they didn't look as if they were going to trouble us.
"I'm not sure if the goalie could have got the corner that led to their goal and I don't think it was corner in the first place but somebody has got a free header.
"I spend hours and hours talking about marking from corners so when we concede from a corner it is like pulling out my teeth with no anaesthetic and it will cost us promotion if we carry on doing it."
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