Four batsmen from three clubs hammered centuries in Saturday's round six of Illawarra cricket.

Keira skipper Graeme Batty smashed a third ton of the season to steer unbeaten Keira to victory over competition leaders Helensburgh.

Batty's third century came in just five innings this season to give him a Bradman-like average of 128, and this one helped Keira end the Burgh's unbeaten campaign.

Meanwhile, Aaron Hickson (115 not out) and Dale Scifleet (117 not out) may have set a batting record with an unbroken second-wicket partnership of 236 as Dapto chased down Port Kembla's 7/252 with 10 overs spare at Reed Park.

Adam Berwick cashed in on a great day for batsmen, blasting 100 for Balgownie (3/260) and putting on 162 with opening partner Hayden Daley (81) in Bally's 76-run win over Wests Illawarra (184) at Judy Masters Oval.

At Helensburgh Oval, Batty plundered 103 out of Keira's 6/238, with the visitors taking the maximum 20 points by dismissing the Burgh for 169 (Hayden McRae, 67) in the 51st over.

Illawarra skipper Batty has scored 512 runs, with a lowest score of 67 against Balgownie.

Round two was washed out, while Batty belted 130 in the opening round against University, then an unbeaten 123 against Northern Districts, 89 against Corrimal, 67 against Balgownie and now 103 against reigning one-day champions Helensburgh.

"He could score 1000 runs this season, that's how well he is batting," Helensburgh skipper Tim Lloyd acknowledged.

Meanwhile, Northern Districts' five wicket win over University earned the Butchers their first one-day win of the season. Butchers captain Tommi Bozinovski (4/22) took the first four Uni wickets, then off-spinner Neil Ryan took a career best 5/22 with the Students rolled for 146.

Josh Colmer (50 not out) led Norths to victory.

"It's a relief," Bozinovski said of the club's first win.

"Considering we had James Broadbent and Mark Johnson out it was a very positive effort. We worked hard with the ball and finished it off with the bat."

Wollongong continued their unbeaten start to the one-day comp with a five-wicket win over Corrimal at Dalton Park.

Troy Yabsley (4/34) and Geoff Golding (3/28) rolled Corrimal for 129.

Wollongong were 5/43 before skipper Dave Studholme (51 not out) and Andrew Hicks (29 not out) sealed the victory.