Having Memorial Park to themselves with no Premier games, last year's two beaten championship semifinalists Marist Celtic and Taihape played out a close match, with Celtic coming from 12 points behind at halftime to win 24-17.
The 2017 championship runnersup Kelso Hunterville moved straight to the top of the table after their big 54-10 win over the 2017 consolation trophy winners Ruapehu.
Counties is the other team to make the Top 4 courtesy of a four-try bonus point after beating Kaierau 29-0 at McNab Domain.
Results, March 17
Tasman Tanning Senior, Round 1.
At Spriggens Park: Black Bull Liquor Pirates bt Marist Buffalo's 39-5. HT: 15-5.
At McNab Domain: Counties bt Kaierau 29-0. HT: 15-0.
At Marton Park (Stihl Shop Wanganui Challenge Shield): Border bt Speirs Food Marton 15-13. HT: 3-0.
At Ohakune: Kelso Hunterville bt Ruapehu 52-10. HT: 24-0.
At Taihape: Marist Celtic bt Taihape 24-17. HT: 17-5 Taihape.