North closed the halftime gap when Hurricanes centre Richard Buckman popped a deft pass to Blues winger Sherwin Stowers for the try.
But South pushed ahead again when, after a huge overlap on the left, Baker scooted in for his side's fourth try.
Just three minutes later, Baker grabbed his second following a big break by Highlanders team-mate Kade Poki.
There was a popular try to finish the game when Chiefs winger Robbie Robinson, a good Southland man, scored his second.
North dominated the early stages of the game and scored the opening try after 12 minutes when Blues winger David Raikuna popped a lovely pass to Robinson.
The South struck back with a neat try to Crusaders first five Tom Marshall, and grabbed a second through another Crusader, Adam Whitelock.
The match came to life in the latter stages of the first half following some fisticuffs, with the South capitalising on a shift in momentum by scoring a third try.
It looked doubtful, but the TMO decided Crusaders flanker Matt Todd must have grounded the ball under a heap of bodies.
South 32 (Kurt Baker 2, Tom Marshall, Adam Whitelock, Matt Todd tries; Baker 2 cons, pen), North 24 (Robbie Robinson 2, Sherwin Stowers tries; Lachie Munro 2 cons, pen, Robinson con). HT: South 22-10.