The match between Otago Sparks and Wellington Blaze was a rout in Upper Hutt, where Otago were dismissed for 41 in response to Wellington's 289 for eight.
Allrounder Sophie Devine starred for second-placed Wellington, scoring 92 -- alongside Lucy Doolan's 91 -- before taking four for 11.
Devine's knock included six boundaries and a six and was hit off just 87 deliveries.
Suzie Bates was Otago's best bowler with three for 49.
Only two Otago batters made double figures with opener Katey Martin's 11 the best.
Of Devine's four wickets three were top order batsmen who were all clean bowled.
Blaze new ball bowler Sian Ruck was also impressive taking three for 19.