Donnybrook remains in finals contention following its 55-point triumph over Busselton at Bovell Park.
The reigning premiers controlled the contest and slotted five unanswered goals in the first half.
Unfazed by the opposition, the Dons went on to claim a decisive 11.5 (71) to 1.10 (16) victory.
Harry Curtin's snap kick, from 20 metres out, led to the Magpies' first and only goal.
Busselton resides in eighth spot with three wins and eight losses after 11 rounds.
Harvey-Brunswick-Leschenault is now the odds-on favourite to take out this year's South West Football League premiership title.
The Lions were confident ahead of their showdown with Bunbury on Sunday afternoon, at PC Payne Park.
After kicking three goals to two in the first quarter, the league leaders scored another two majors, and conceded just one point, in the second.
HBL then hit the accelerator, and claimed seven goals to one in the third term. Leading by 48 at the final change, the visitors stormed home to win 14.7 (91) to 7.5 (47).
Eaton retained second spot on the ladder with a convincing display against the Panthers, at Kelly Park.
The Boomers leapt off the blocks, before kicking five goals to one in the first quarter.
Following a one-sided second term, the side posted another three goals to one in the third.
The Panthers suffered a crushing 10.8 (68) to 13.15 (93) defeat and slipped to sixth in Round 11.
Returning to the Collie Recreation Ground, the Eagles marched to a resounding 60-point win over eighth-placed South Bunbury.
Kicking with the wind, Collie secured five goals to one in the first half. the side moved to seventh after thrashing the Tigers 11.12 (78) to 2.6 (18).
Donnybrook remains in finals contention following its 55-point triumph over Busselton at Bovell Park.
The reigning premiers controlled the contest and slotted five unanswered goals in the first half. Unfazed by the opposition, the Dons went on to claim a decisive 11.5 (71) to 1.10 (16) victory.
Entertaining the fans at Gloucester Park, Augusta-Margaret River notched up a 17.13 (115) to 9.4 (58) win over the Harvey Bulls.
Scoring nine goals to four in the first half, the Hawks then led comfortably throughout the second.
Coming off a shock loss to Eaton in Round 10, Collie's Women's side suffered a crushing 8.18 (66) to 1.0 (6) loss against South Bunbury.
The Boomers moved off the bottom of the ladder with a 6.7 (43) to 0.3 (3) win over Carey Park on Sunday afternoon.
Bunbury held onto third spot with a 7.3 (45) to 0.3 (3) thrashing of fifth-placed Harvey-Brunswick-Leschenault.
