Things looked bleak for the Sports when the Hampshire side, one of only two sides below them in the table, took the lead but Diarra levelled just before the break and Sheriff got what proved to be the winner.
It leaves Adam Murray’s team just three points from the first side outside the bottom four – Taunton Town – and gives them new hope they can stay up.
See pictures from the victory by Lydia and Nick Redman on this page and the ones linked and get the latest from Priory Lane in the Herald, out on Friday.
1. Eastbourne Borough v Havant and Waterlooville pictures by Lydia and Nick Redman (39).jpg
Action from Eastbourne Borough's vital win at home to Havant and Waterlooville in National League South Photo: Lydia Redman:Lydia and Nick Redman
2. Eastbourne Borough v Havant and Waterlooville pictures by Lydia and Nick Redman (42).jpg
Action from Eastbourne Borough's vital win at home to Havant and Waterlooville in National League South Photo: Lydia Redman:Lydia and Nick Redman
3. Eastbourne Borough v Havant and Waterlooville pictures by Lydia and Nick Redman (36).jpg
Action from Eastbourne Borough's vital win at home to Havant and Waterlooville in National League South Photo: Lydia Redman:Lydia and Nick Redman
4. Eastbourne Borough v Havant and Waterlooville pictures by Lydia and Nick Redman (6).jpg
Action from Eastbourne Borough's vital win at home to Havant and Waterlooville in National League South Photo: Lydia Redman:Lydia and Nick Redman