However, star Australian import Jamie Dwyer and former Black Sticks star Ryan Archibald made the difference in the last couple of minutes, with one goal apiece.
Southern needed a shootout to get past Harbour in a goalless match, Nick Ross grabbing the winner in sudden death.
Northland continue to lead the women's K Cup, but this time their win was far from clear-cut against bottom side Southern. The game finished 2-2, and Northland required a penalty shootout win, 3-1, to retain a two-point lead over resurgent Auckland going into today's rest day.
Auckland's third successive win, 2-1 over Canterbury yesterday, has them eyeing the playoffs.
Pippa Hayward had Canterbury in front before international Krystal Forgesson equalised shortly before halftime. The winner came from a firm penalty corner strike by Su Arn Kwek just before three-quarter time. Auckland held off determined Canterbury efforts late on, with up-and-coming Black Sticks defender Liz Thompson a standout.
"It was a good, solid team performance," Auckland coach Jude Menezes said yesterday. "We are getting better with every game."
Defending champions Midlands and Harbour also had wins in shootouts over Capital and Central respectively.
The sixth round will be at North Harbour tomorrow.