Unbeaten Christchurch have won the title twice in a row and five out of the past six years.
Against Palmerston North at Fitzherbert Park on Thursday, Christchurch batted first and scored 261-8.
Ben Hartland, who scored a century on Thursday, scored 91 and Louie Chapman scored 81.
Jack Harris took 3-58 opening the bowling for Palmerston North and spinner Ben O'Connor grabbed 3-56.
Palmerston North were then bowled out for 211 in 47.1 overs
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