Brendan McCullum hit an unbeaten century to help the Otago Volts cruise to a 5 wicket victory over the Auckland Aces at the University Oval in Dunedin.
McCullum scored 108 off just 67 balls to help the Volts reach their target of 169. His knock included 10 fours and 4 sixes.
The Volts opener enjoyed a partnership of 101 with Hamish Rutherford as the pair steered the defending champs towards victory.
Despite three wickets from Scott Styris the Aces were unable to mount any sort of challenge to leave the Volts in second place and on course for a place in the HRV Cup final.