Roffey FC have tipped Sussex County League Division 3 rivals Sidlesham for honours this season.
Sidlesham were promoted alongside Billinghsurst from the West Sussex League, and inflicted a 4-2 home defeat on the Horsham side on Saturday.
Roffey had taken a 2-1 lead through Sam Matthews and Matt Phelan before Sidlesham hit back.
Assistant manager Graham Powell said: “The scoreline flattered us really,” Powell admitted. “They are a good side and we came down to earth with a bump after last week’s win. It will take a good side to stop them.”