South Bunbury sits third on the ladder after winning 9.5.59 to 2.0.12 against Busselton.
After kicking five unanswered goals in the first half, the Tigers sat comfortably in the second.
Despite picking up form in the second half, the Magpies were no match for the Tigers.
During the clash at Hands Oval, fans and players celebrated as Kevin Nettleton umpired his 700th game.
The Harvey Bulls remain second on the 2018 South West Football League ladder thanks to a 41-point win over Eaton Boomers.
The Bulls and Boomers played out a tight first quarter, with Harvey ahead by four at the first change.
Harvey kicked another two goals in the second, before both teams played out a scoreless third quarter.
Spurred on by a fiery home crowd, the Bulls slotted four goals in the final term.
Harvey kept Eaton to three points throughout the game, going on to win 6.8.44 to 0.3.3.
The Bunbury Bulldogs maintained its unbeaten run with a crushing victory over the Collie Eagles.
Holding the Eagles to one point in the first half, Bunbury booted one goal in the first quarter before kicking five in the second term.
The Eagles kicked their second and final point of the game in the second half, before the Bulldogs slotted another two goals.
The Bulldogs remain premiership favourites following their 7.8.50 to 0.2.2 win.
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