Kiama captain Zac Parker is confident Saturday's breakthrough victory will be the first of many this season.
Competing in the first grade competition as a single entity for the first time since 2016-17, the Cavaliers claimed a win over Kookas.
With light fading and net run rate the determining factor in matches that are cut short, Nathan Barr picked up the pace late in the innings.
Bad light ended play 43 overs into Kiama's innings, the hosts reaching 7-194 in response to Kookas 9-219.
That was enough for the Cavaliers to prevail by the barest of margins.
"It was unreal," Parker said. "It's the first time Kiama itself is back in first grade in four years, so it was awesome. It's even better when you are captain.
"Nathan knew the rules, it was getting really dark and he was able to pick up the run rate and get us the win."
With their first victory secured, Parker is confident his side is a finals contender.
"There is still a lot more we can improve on. We had a couple of players out, we're a real chance of making finals."
Elsewhere, Lake Illawarra defeated Shellharbour and The Rail edged Oak Flats by one run.