Auckland's opponents in the Plunket Shield are probably starting to wish Colin Munro had earned elevation to the test team.

The batsman today continued his incandescent form in the red-ball format, smashing another quickfire century to help Auckland seize ascendancy at the halfway point of their clash with Otago.

Munro's sheer weight of runs has become impossible to ignore - except to the national selectors, that is - and he once more blasted his way into the headlines at University Oval.

After Lockie Ferguson (5-53) wrapped up the Otago tail, Munro came to the crease with Auckland in trouble on 43-3. The one-test Black Cap then proceeded to smear the hosts all around the ground, carving nine fours and six sixes before being dismissed for 102 off 85 balls.

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The ton was Munro's fourth in seven Plunket Shield innings and left him averaging 96.2 this season, lifting his career first-class average to 52.6 from 45 matches.

It also saw Auckland compile 304 to take a first-innings lead of 22 runs, bolstering their position when Ferguson struck to reduce Otago to 6-1 at stumps. But despite the best efforts of Munro and Ferguson, the Plunket Shield still looks like Canterbury's to lose.

Having entered to penultimate round with a 19-point advantage, Canterbury put themselves in a strong position on the second day of their encounter with Central Districts. They first advanced their total to 388 then reduced CD to 247-6, with Will Young (102no) contributing the majority of the runs.

In Mt Maunganui, Northern Districts reached 252-8 by stumps, holding a 101-run lead over Wellington.