Records were broken around the country in the fourth week of the Mitre 10 Heartland Championship as South Canterbury butchered East Coast with a century of points in Timaru on Saturday.

The 100-7 rout was the South Canterbury union's biggest ever victory, surpassing the 94-7 win over North Otago in the old NPC Third Division format in 1994.

Scoring three tries inside of 12 minutes, the die was cast early and although East Coast got a reply seven pointer through halfback Sam Parkes, it proved only a temporary reprieve.

South Canterbury scored three more times to lead 40-7 at halftime, and then went nuts in the second stanza with nine tries as the visitors, who have had injury issues, just disappeared.

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Reserve fullback Brad Tunnicliffe is erasing the nightmare of his poor showing at Cooks Gardens after scoring a hat trick of tries, as did openside flanker and captain Nick Strachan.

Starting fullback Henry Scott, who switched to centre, got a double, as did winger Setefano Sauqaqa, while halfback Willie Wright and replacement Theo Davidson landed ten conversions between them.

Since losing to Wanganui in the opening round, South Canterbury have been smashing the opposition, scoring 192 points in three games to move up to third on the table behind the unbeaten leaders.

King Country kept their undefeated moniker intact, eventually, as they pulled away from a game Thames Valley to win 37-29 at Te Aroha's Boyd Park.

Kicking off early at 2pm, it was a nearly scoreless first quarter before both team's traded tries to ultimately still be deadlocked 17-all at the break.

The visitors put the match away with their fifth try to see the home side drop out of the Top 4, joining a tight battle from the fourth to ninth spots on the table where those teams have two wins and two losses each.

Joe Perawiti, Ratu Vosaki, Chulain Mabbett-Sowerby, Tana Tuakaraina, and Tim Hounsell scored their tries.

Thames Valley's five pointers came from winger Kieran Lee, hooker Glen McIntyre, reserve back Ethan Seymour and centre Sam McCahon.

The win sets up a big match in Te Kuiti where Wanganui will defend the Sir Colin Meads Memorial Trophy that was contested for the first time last year.

The other surprise record broken on Saturday happened at Masterton's Memorial Park, as the campaign of Meads Cup playoff regulars Buller is confirmed to have flown right off the handle after being over run 61-29 by Wairarapa Bush.

Young winger Soli Malatai became the first player from the home union to score five tries in a match, surpassing the three previous occasions when players scored four tries – twice in the 1980's and once in the mid-1990's.

First-five Glen Walters was one of Wairarapa Bush's four other tryscorers, plus adding eight from nine conversion attempts for a 21-point haul.

On the wide open artificial turf, Buller scored five tries of their own to at least get a bonus point, but with only four points so far they sit down the bottom of the table with only East Coast below them, who they will not play, meaning Meads Cup contention is gone and even making the Lochore Cup playoffs could be a struggle.

The other team on the outside looking in is Poverty Bay, despite a commendable effort down in Greymouth as West Coast was lucky to get away with a 31-30 win to rebound from two competitive losses.

The visitors took a 12-7 advantage in the first half, which they held to lead 19-14 at the break.

However, the home side scored three tries to one in the second half, along the match stayed close as West Coast first-five Tom Reekie could only convert one of them, whereas Poverty Bay added a couple of penalty kicks.

Andrew Tauatevalu scored two tries while getting one of those three-pointers, but it just wasn't enough to hang on.

Openside flanker Steve Soper scored two tries for the home team, allowing them to stay in touching distance of the Top 4.

Also playing for survival was Horowhenua-Kapiti, who sprung the upset of the round by heading down to Oamaru and coming from behind to defeat North Otago 27-24.

Having been beaten by both the Canterbury teams, Horowhenua-Kapiti needed points to stay in contention, and after trailing 17-7 in the first half, a converted try right near the break gave them confidence.

North Otago would get another converted try in the second half, with first-five Josh Buchan having scored one of them plus converting all three and adding a penalty for 14 points.

However, Horowhenua-Kapiti brought their own radar-accurate kicker, with first-five James So'oialo converting their three tries and adding two penalties in the second half to pick up a crucial win.

Expat Wanganui player Timoci 'Jim' Seruwalu scored a try from second-five.

Results, Week 4.

King Country 37 (Joe Perawiti, Ratu Vosaki, Chulain Mabbett-Sowerby, Tana Tuakaraina, Tim Hounsell tries; Evan Reihana 2 pen, 3 con) bt Thames Valley 29 (Kieran Lee, Glen McIntyre, Ethan Seymour, Sam McCahon tries; Reece Broughton pen, 3 con). HT: 17-17.

Wanganui 30 (Craig Clare, Michael Tafili, Penijamini Nabainivalu, Dylan Gallien tries; Clare 2 pen, 2 con) bt Mid Canterbury (Tom Hanham-Carter, Brian Matormusha tries; Andrew Letham con). HT: 20-7.

Horowhenua Kapiti 27 (Dylan Taylor, Kalim Kelemete, Timoci Seruwalu tries; James So'oialo 2 pen, 3 con) bt North Otago 24 (Simon Lilicama, Hemaua Samasoni, Josh Buchan tries; Buchan pen, 3 con). HT: 17-14 North Otago.

Wairarapa Bush 61 (Soli Malatai 5, Inia Katia, Mike Lealeva'a, Glen Walters, Nick Olson tries; Walters 8 con) bt Buller 29 (Sam Marris, Kahutia Parata, Caleb Aperahama, Petaia Saukuru, Iliesa Ravudra tries; Michael Wells 2 con).

West Coast 31 (Steve Soper 2, Oliver Dimmick, Sean McClue, Nik Cumming tries; Tom Reekie 3 con) bt Poverty Bay 30 (Andrew Tauatevalu 2, Andrew Petelo, Te Peehi Fairlie tries; Kelvin Smith pen, 2 con, Tauatevalu pen). HT: 19-14 Poverty Bay.

South Canterbury 100 (Nick Strachan 3, Brad Tunnicliffe 3, Setefano Sauqaqa 2, Henry Scott 2, Loni Toumohuni, Willie Wright, Solomone Lavaka, Kalafini Leatigaga, Kieran Coll tries; Wright 6 con, Theo Davidson 4 con) bt East Coast 7 (Sam Parkes try; Ngarangi Haerewa con). HT: 40-7.