Defence has been the buzzword among the Jamberoo Superoos heading into Saturday's season-opening battle with neighbours Kiama at Kevin Walsh Oval.

The Superoos finished third in 2013 and based their game around a free-flowing offence.

While they haven't suddenly lost the ability to run up big scores, the Roos are focused on being far less charitable when it comes to conceding points.

"If we can get our defence right, our attack should talk for itself, because we've got a very good attacking team," captain-coach Matt Coelho said.

"We've been working on defence a lot in the off-season. It has to be a big focus of ours for the whole season. Our goal is to finish top three. We came third last year and hopefully we can go two better this year.

"Gerringong and Warilla will be the teams to beat, and obviously Shellharbour will be up there in their first year back in the competition."

Jamberoo lost four players in the off-season but welcomed six recruits, all of whom are lining up against the Knights.

"It's always hard against Kiama," Coelho said.

"Every game seems to go down to the wire."

Four games will be held before first grade kicks off at 2.45pm.

"It's going to be a mudbath by the afternoon," Coelho said.

"The wet weather makes it anybody's game. It brings it right back to a level playing field."

The week-long deluge led to the postponement of two games - Gerringong's home clash with Berry-Shoalhaven Heads on Saturday and Sunday's meeting between Milton-Ulladulla and Nowra-Bomaderry at Mollymook Oval are both off. Albion Park-Oak Flats host Port Kembla on Saturday, while Warilla host Shellharbour on Sunday.

Group Seven officials were forced to reshape the draw after Batemans Bay withdrew from first grade earlier this week.

The Tigers, who had a first-round bye, claimed that a lack of players had left them no option but to pull out.