Eastbourne Borough suffered defeat for the first time at home under Lee Bradbury as Dulwich Hamlet moved into second spot in the National League South after a clinical display at Priory Lane.
Danny Mills scored twice in the first half to put the visitors on course for victory, and despite an improved second half performance, a stoppage time goal from Reise Allassani wrapped up the points.
The visitors started on the front foot, with Kieran Monlouis forcing Tom Hadler into a smart low save, before Kieran Khinda-John did well to clear a dangerous Nyren Clunis cross.
Borough then had a great chance to break the deadlock when Tobi Adebayo-Rowling’s cross from the right picked out Charlie Walker in the middle, but his header was brilliantly turned away by the diving Ashley Maynard-Brewer.
Hamlet then broke the deadlock after a short corner routine eventually saw Aaron Barnes whip the ball in and Mills shrugged off his marker to head past Hadler.
And the striker doubled his side’s lead before half-time after Clunis beat Kristian Campbell down the right, and his cross found the marksman in space at the far post to head beyond the Sports keeper.
After a double substitution at the break, Borough came out with intent in the second half with Walker going close before Dean Cox had a free-kick blocked.
Lee Bradbury’s side were then denied by the woodwork as Mike West’s free-kick picked out Khinda-John, but his header came back off the bar with the keeper beaten.
However, Dulwich would have the final say as substitute Allassani, making his return to the club after a loan switch from Coventry City, raced clear in stoppage time and fired past Hadler.