Eastern Pirates have since picked up where they left off at the end of last season, extending their impressive record in 40-over matches.
"We have not lost a [40-over] game in 15 games," Pirates captain Johnny Wiringi said.
"We have been playing some really good cricket."
Their top order had been batting well this year but would need to play well again to beat Old Boys, who are also undefeated this season.
"It all depends on our top five, all of our top five have scored 50s this season," he said.
"And we have a good couple of Sri Lankan bowlers that do well for us as well."
He said they had a great culture in the side at the moment which was helping them get the results.
"We have a really good brotherhood within the team. And Rob Harvey from Dawson Insurance has helped us out a lot, sponsoring us with all ourplaying shirts and stuff.
"That has taken a lot of strain off the club," he said.
Eastern Pirates and Taupo Old Boys had their match rained out earlier this season.