Southland's beaten Bay of Plenty 19-12 in a top of the table provincial championship rugby clash in in Invercargill.
The home side lead 16-6 at half-time after scoring the game's only try.
First-five Robbie Robnson secured the win late in the second half with his fourth penalty goal in a faultless display of goal kicking.
Tasman beat Waikato 23-9 in Blenheim in the other match after leading 10-9 at half-time.
