Buller first five-eighths James Lash kicked a dropped goal in the last minute to deny Mid Canterbury a draw in their Mitre 10 Heartland game in Westport on Saturday.
It was a great way for Logan Mundy to celebrate his 100th game for the union while flanker Luke Brownley and Ciaran Neilsen had big games in the forwards with Lash, Setefano Sauqaqa and Joshua Tuidriva performing well in the backline.
South Canterbury maintained their winning momentum with a 58-20 win over West Coast in Greymouth while in Ruatoria Wanganui made it two in a row with a 74-8 win over East Coast.
Games played in the Heartland are under the scoring trials of six points for a try and all goal-kicks worth two points. Teams also receive a bonus point if finishing within eight points of the winners.
East Coast 8 (BJ Sidney try; Todd Dolan con)
Wanganui 74 (Simon Dibben 2, Kameli Kuruyabaki, Cole Baldwin, Tremaine Gilbert, Gavin Thornbury, Te Rangitira Waitokia 2, Craig Clare, Ace Malo tries; Dane Whale 5 con, Steve Crosbie 2 con)
North Otago 30 (Ralph Darling, Josh Casey, Matt Posea, Lemi Masoe tries; Casey 3 con)
Thames Valley 22 (Jonnie Te Ruki-Chambers, Rupeni Vakacugu, Hayden Wisnoski tries; Wisnoski 2 con)
Buller 34 (James Lash, Anthony Tailua, Joshua Tuidriva, Dan Hytongue tries; Lash 4 con, dropped goal)
Mid Canterbury 32 (Logan Bonnington, Jarred Percival, Mike Lynch, Timoci Nabakeke tries; Percival 4 con)
King Country 30 (Sam Mason, Kieron Robinson, Ralulu Bovau, Zayn Tipping tries; Tipping 2 con, pen)
Poverty Bay 24 (Les Hills, Tani Misikosi, Ratu Daurua tries; Isaia Vuki 2 con, 2 pen)
West Coast 20 (Troy Tauwhare, Maleli Mudu, Logan Winter tries; Nik Cumming con)
South Canterbury 58 (Viliame Logavatu 2, Mosese Aho, John Dyer, Raitube Vasurakuta, Maxx Morris, Kieran Coll, Shay Moseby tries; Zac Southen 5 con)
Horowhenua Kapiti 22 (Tyson Maki, penalty try tries; Perry Hayman con, 2 pen; Warwick Lahmert pen)
Wairarapa Bush 32 (Andrew Smith, James Goodger, Zac Guildford, Sam Monaghan tries; Tim Priest 2 con, 2 pen)