Welsh winger Otto Carlisle scored two tries as Horsham earned a 24-0 win at Rye in Sussex One.
Rob Clegg and Tim Wills added scores with coach Andy Smith also impressed by his side's defensive efforts.
Jason Pheasant and Danny Newby scored first half tries to put Seaford on course for the double over Hellingly.
It finished 27-13 as Nick Everson and Simon Baker added tries with Ben Cox kicking seven points Crowborough had a home walkover against UC Chichester.
Burgess Hill took another step towards the Sussex Two title with a 22-10 defeat of Midhurst. Jon Cook, Neil Upton, Richard Meredith and Alistair Pringle scored tries and David Webb added a conversion.
Andy Stephenson crossed twice for Royal and Sun Alliance in a 39-6 derby defeat of Barns Green. Peter Downes, David Price, Gary Bicknell, Paul Bowen and a penalty try completed the win with Peter Long kicking two conversions.
Newick were 31-10 winners at Sussex Police, scoring five tries in the progress. Derek Rees (2), Ian Harding, Nick Ripley and Kevin Byrne got them with Byrne adding three conversions.
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