Kieran Gray smashed an unbeaten century and half century to lead Oak Flats to victory in Sunday's South Coast Twenty20 semi-final and final.

Gray bludgeoned an unbeaten 126, including 11 massive sixes in the semi-final win over Gerringong, then blasted 68 in the final against Lake Illawarra at Howard Fowles Oval.

Michael Arblaster also stamped his class, making an undefeated 49 against the Jets and 62 in the final.

"We're lucky to have tremendous players like Michael and Kieran in our side," Oak Flats skipper Ryan Chatterton said.

"Kieran's 126 was phenomenal. It was power hitting at its best."

Batting first in the final, Oak Flats piled on the pressure making 3-185.

Mark Ulcigrai (1-27) was the best of the Lakers bowlers, but 16 wides reflected a sub-par bowling effort.

The Lakers always battled to keep up with the nine-an-over run chase and finished 7-159, with skipper Shane Cody (58) and opener Kerrod White (26) top scorers.

Ben Morrow took 3-23 for the Rats, who made it back-to-back T20 titles.

In the morning semi-finals, Lakers had a 37-run win over Albion Park.

Batting first the Lakers posted 8-119, with Cody making a run-a-ball 41 and Sam Constantinou 24.

Park skipper Adam Coughlan took 2-18.

The Park were dismissed for 82, with three run outs. Jamie Crowhurst took 2-15 and Ryan Smith 2-18.

Oak Flats (1-193) were too strong for Gerringong (7-136) in the other semi.

Jesse O'Hare (38 not out) top scored for the Jets, with Chatterton taking 3-24 for Oak Flats.