Round 6 was the highlight of the bout as Rapira landed some great counterpunches, trying to increase his urgency, but Berridge opened up his opponent's cheek and now had a target to aim at.
Entering the final rounds and Berridge, whose face was unmarked after previously being a heavy bleeder on his own cheekbones, had figured out Rapira's timing and connected beautifully with his hook, while ducking under Rapira's 1-2 combination jabs.
This suitably impressed the judges, who gave him a unanimous decision win.
The home town crowd tried to rally Rapira in the final round and booed when their guy slipped into the ropes and Berridge landed a blow to his back, but the scorecards did reflect a clear winner.
Berridge will now focus on his long awaited grudge match with Auckland's Adrian Taihia (15-2-2) in Auckland on October 28.