Both teams had earlier accounted for North Otago, with Otago winning 12-0 and Lakes prevailing 10-2, before both beat Lakes B 10-2, so the final round was the decider. Lakes B beat North Otago by four games on countback to take third place.
In the main final the result mirrored the last time the teams met in Dunedin when Lakes also won all the doubles.
Otago's Libby Scott beat national 14s Masters winner Ines Stephani for the loss of only two games and Georgia Hume and Rileigh Fields battled for long, hard, three-set wins against Li Ying Moroney and Suma Ito respectively.
Fields was particularly impressive in hitting four clean winners to seal her result and Hume was gradually working back to form after an absence from competitive play. However Jessie Stevenson, after a promising first day, found Felicity Oxnevad too consistent.
Carlos Reid held on to outlast Chris Bradley in the third set and Mitchell Sizemore was pushed by national junior squad member Thomas Hartono before taking a 6-4, 6-4 win.
Aaron Hicks lost 3-6, 2-6 to Perry Crockett in the top single and former touring pro Lan Bale showed his class, allowing Ryan Eggers only four games. Bale was a huge factor in guiding his junior partner Hartono to a doubles win, too.
After both men's doubles were lost, Otago split their women's doubles pairs, when needing to win both, but came up short, although Hume and Fields took Moroney and Ito to a match tiebreak.
The absence of both Lakes' No 1s, Emilia Price and Riki McLachlan, through injury made their win all the more meritorious. McLachlan was a late withdrawal after being hit in the eye with a ball.
The second round will be played in Dunedin in February.
