However, Southern Lakes retains the Rennie Trophy after winning the first round 10-2 in November.
Fortunes seesawed throughout the early part of the day and scores were level at 4-4 after the singles. However, due to weather delays and limited availability of indoor courts, the Lakes team sensationally forfeited the last three doubles and Otago won the only one completed to take a 5-4 lead before the defaults.
In the feature match, two of New Zealand's top-ranked juniors clashed in a hard-hitting, tension-filled match.
Louise Oxnevad beat Otago's Libby Scott 7-5, 6-2.
Former Otago titleholders Justin Russell and Mark Milburn, playing for Lakes, put on strong tactical displays before beating Jeff Elliotte and Carlos Reid respectively in tight two-setters.
Sian English, who had an impressive weekend, and Campbell Higgins were easy winners for Otago, but there was disappointment that, as the tie was building to a climax, the Lakes team chose to leave mid-afternoon.
Otago and Lakes notched up similar wins against Southland on Saturday. Otago won 9-3 and Lakes 9-2, with one rubber rained off.
The Otago women were dominant, losing only six games in their four singles wins although dropping the bottom double in three sets.
With three teenagers in the men's squad being given an opportunity, Otago dropped two rubbers and was pushed to three-setters in others.
Lakes men dominated Southland and it was only in the lower-order women where Southland picked up consolation points.
The second division was won by Otago B, which who won enough rubbers in the men to cover the loss by the women against North Otago A.
•Marina Erakovic failed in her bid to become the first New Zealander to win on the WTA Tour since 1989, losing the final of the Memphis international yesterday to Sofia Arvidsson, The New Zealand Herald reported..
Erakovic succumbed in straight sets 3-6, 4-6 in a match that lasted 84 minutes.
It will be a bitter blow for Erakovic, who went into the final ranked 18 places higher than the Swede, but struggled throughout on serve with a 48% first serve ratio.
She gave up eight break points and lost three, while stealing a game on Arvidsson's serve just once.
The 23-year-old Aucklander will take comfort in the fact that she will achieve her highest world ranking, probably in the mid-40s, when they are released today.
That surpasses her previous highest of 49, set in 2008.
