In a nine-goal thriller, Havant came from 2-4 down to level at 4-4 with two minutes remaining only to then concede again.
It was their second successive loss after an opening-day defeat at Sevenoaks.
Pictures: Chris Moorhouse
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Picture gallery – Havant 4 Brighton 5, National League Division 1 South
By Simon Carter
Published 6th Oct 2021, 12:43 GMT
Havant suffered a last-gasp defeat in a high-scoring National League Division 1 South home clash with Brighton.