Champions Steyning suffered a shock defeat to relegated Crawley, losing for only the second time this season as they completed their campaign on Saturday.
Steyning, who were crowned champions two weeks ago after having already sealed promotion, suffered a 153-run defeat away to season strugglers Crawley.
The visitors, who fielded a young side, were also without captain Dave Kennett and, having lost the toss, Crawley opted to bat and posted 283-8 in 53 overs, before Steyning struggled to 130 all out in 36.2 overs.
Harry Chaudhary top-scored for Crawley with 132 after they had initially fell to 14-2, while Steyning’s highest totals came from Sam Sutterlin (31) and Ben Shelford (33) after they had been reduced to just 15-4 in their reply.
Kennett said: “It was disappointing to lose but we had a lot players missing and decided to field a few youngsters in the team to give them some experience.
“I am looking forward to next year and taking the momentum from this season into it and hopefully we can get of to a good start and compete at the top of Division 3.
“I am very please with how the season went. We said at the start we want to gain promotion in our first season in Division 4 and we did that and in some style.”