Subiaco's defence was rock solid as well with Declan Jackson and Aaron Heal keeping Michael Lourey and Max Duffy goalless respectively while Greg Broughton had 24 touches and Jordan Lockyer 21.

Little went right for West Perth despite Strijk's performance up forward kicking four goals from 22 possessions and 11 marks.

Shane Nelson did rack up 34 disposals before going off in the final quarter and later going to hospital with a suspected broken nose and fractured upper jaw.

Dean Munns did another good tagging job holding Subiaco captain Kyal Horsley to 16 possessions while Rohan Kerr had 23 touches for West Perth, Aaron Black 21, Trent Manzone 21 and Blake Wilhelm 19.

Then in Carnarvon, it was goal for goal between South Fremantle and Perth in the opening quarter before the Demons kicked away in a tremendous second term with the first six goals to lead by as much as 31 points before the Bulldogs pulled back a late goal to Haiden Schloithe.

A loss could have put South Fremantle's second position in jeopardy but the Bulldogs came out inspired in the second half starting with an early goal to Zac Strom and then Ben Saunders' second.

Five goals then in the last 10 minutes of the third quarter saw the Bulldogs answer a couple of Perth goals emphatically but the Demons still clung to a one-point three quarter-time advantage.

It took 10 minutes for the first goal of the last quarter and that came to South Fremantle with Saunders booting his third. Mason Shaw then soon added his third and fourth of day, and Schloithe kicked his third in response to a Perth goal.

South Fremantle had all the answers, though, and Saunders ended up booting his fourth, Shaw his fifth and Steven Verrier his second as the Bulldogs ended up winning by 37 points after earlier trailing by 31.

South Fremantle's forward-line got on top more as the day went on with Shaw finishing with five goals from 20 possessions and 10 marks, Saunders four goals from 13 touches and seven marks, Schloithe three goals from 22 disposals and eight marks, and Blaine Johnson two goals.

Steven Verrier also kicked two goals along with 21 possessions and seven marks while Brendan Verrier finished with 28 disposals and eight marks. Dylan Main also had 27 touches for the Bulldogs, Jacob Dragovich 24, Marlion Pickett 20, Ryan Cook 19 and Shane Hockey 19.

Spencer White, Dene White and exciting debutant Cody Ninyette all kicked two goals apiece for Perth.

Michael Sinclair racked up another 36 possessions and 16 marks off half-back for the Demons with Clint Jones compiling 36 disposals in his 101st WAFL match with 84 of those previously coming with South Fremantle and now 17 with Perth.

Closer to home, Peel Thunder delivered a strong performance to beat East Perth by 36 points at Medibank Stadium to move clear of the Royals into fourth position on the WAFL ladder.

East Perth actually led by five points at quarter-time after kicking two goals to one but the Thunder got rolling in the second term with five goals to two to take a 12-point advantage into half-time.

Another five goals to nil in the third quarter and Peel had the win secure by the last break and went on to score the important and impressive 36-point victory.

Traye Bennell, Matt Taberner, Jack Hannath and Jonathon Griffin all kicked two goals apiece for Peel as their talls proved a big factor in the victory. Taberner responded to being dropped by Fremantle not only with the two goals but 23 possessions and eight marks.

Ruckmen Griffin (13 touches, 14 marks) and Hannath (17 disposals, 13 hit outs) had a good battle with East Perth's Paul Johnson (20 possessions, eight marks, 19 hit outs) and Jonathan Giles (13 disposals, 17 hit outs, two goals).

Matt de Boer was a dominant presence in the midfield for Peel racking up 39 possessions while Tendai Mzungu finished with 35 disposals, Clancee Pearce 26, Anthony Morabito 26, Rory O'Brien 25, Andrew Haydon 24, Connor Blakely 22, Nick Suban 20 and Josh Deluca 18.

Tom Lamb also kicked two goals for East Perth along with Giles while Luke Partington gathered 25 possessions, Will Maginness 25, Lewis Jetta 23, Brant Colledge 21, Tom Cole 20, Tom Gorter 18 and Eric Mackenzie 18 to go with seven marks.

Then at Steel Blue Oval the bottom two teams did battle but Claremont scored a thumping 54-point win over the wooden spoon bound Swan Districts with the Tigers only further highlighting the damage they would have been capable of if they made finals in 2016.

Claremont kicked the only two goals of the first quarter and then four goals to one in the second to be well on top leading by 28 points at half-time.

Swans did well in the third term matching the three goals from the Tigers but Claremont kicked another five goals to two in the final stanza to win by 54 points.

Beau Maister had a day out up forward for Claremont kicking five goals from 14 possessions and nine marks and he was the only multiple goal scorers of the match.

Jye Bolton racked up another 40 possessions for the Tigers while Tom Shanahan finished with 29 disposals, Justin Speed 26, Ryan Lim 26, Tom Ledger 26, Jared Hardisty 24, Morgan Davies 24 and ruckman Mitch Andrews 19 to go with 38 hit outs.

Jacob Coniglio gathered a team-high 26 possessions for Swan Districts with Jacob Coniglio compiling 25 touches, Adam Faulkner 25, Laurence Grescos 22, Matt Riggio 22, Freddie Clutterbuck 19, Jesse Turner 19 and Brandon Erceg 18.

ROUND 20 McDONALD'S WAFL RESULTS
LEAGUE
Subiaco 12.17 (89) defeated West Perth 5.7 (37)
East Perth 7.11 (53) lost to Peel Thunder 13.11 (89)
South Fremantle 17.11 (113) defeated Perth 11.10 (76)
Swan Districts 6.9 (45) lost to Claremont 14.15 (99)

RESERVES
Subiaco 9.14 (68) defeated West Perth 5.8 (38)
East Perth 21.15 (141) defeated Peel Thunder 7.3 (45)
South Fremantle 12.11 (83) drew with Perth 12.11 (83)
Swan Districts 9.8 (62) lost to Claremont 17.18 (120)

REDiMED COLTS
Subiaco 14.8 (92) defeated West Perth 6.6 (42)
East Perth 13.7 (85) defeated Peel Thunder 6.6 (42)
South Fremantle 7.6 (48) lost to Perth 9.15 (69)
Swan Districts 6.7 (43) lost to Claremont 13.10 (88)