Horsham YMCA's home debut in the Ryman League ended in frustration as they lost 4-3 to Sittingbourne.
The County League champions led three times but were pegged back on each occasion by hat-trick man Andy Doerr before James Campbell hit the winner.
Matt Russell headed YM's first from Rob Mills' free-kick. Pat Massaro put them 2-1 up with a great free-kick into the top corner and also hit the third from the spot.
YM boss John Suter said: "I'm disappointed because we should have won."
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