Oak denied in injury-time
Adam Kneller's free kick evaded everyone and bounced into the far top corner.
Kneller had earlier drawn Seaford level at 2-2 in identical fashion after Oak had stormed into a 2-0 lead inside 13 minutes through Eaton and Porter.
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Hide AdEaton put Oak 3-2 ahead with his second just before half-time before Oak missed several chance to make the game safe in the second half.
MILE OAK: Stuart; Porter, Paine, Lansdale, Loughlin; Fleming, Hall, Pulling; Carden, Burnett, Eaton. Subs: Ash (Fleming 55), Sargent (Carden 70), A.Whittington.
For full report and reaction from Oak manager, Anthony Whittington, see Thursday's Shoreham Herald.