Oakwood beat visiting Saltdean 3-2 despite playing with ten men for more than 70 minutes.
Ben King fired Oakwood ahead on 15 minutes before Mo Shuga'a was sent off for handling on the goalline and Adam Burton levelled with the subsequent penalty.
The Tigers failed to take advantage and Manville restored the lead on 38 minutes before heading in to wrap up victory before the hour mark. David Chapman hit a second consolation.
Sidley thumped Broadbridge Heath 8-0. Wes Tate, Gerard Moyse and Mark Freeman all netted twice with Kevin Rose and Dave Ward also on target.
Manager Peter Heritage said "It could have been more but we are pleased we didn't slip up, which is a risk against the lower league sides."
Miles Scerri scored his 30th goal of the season to earn Arundel a 1-0 win at Southwick. On-loan Woking winger Elliott Cappell's cross was finished by Scerri.
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