East Perth coach Tony Micale had mixed emotions after a 40-point win against co-tenants Subiaco at Medibank Stadium on Saturday.
Conceding the 15.25 (115) to 11.9 (75) victory was important after a surprise loss to Perth in the previous round, Micale said the Royals' inability to put sides away was of some concern.
"I was particularly pleased with our first half and what our key focus points were," Micale said.
"Just working on our structures which were probably the main reason for our loss to Perth.
"I thought we addressed them pretty well, but it was frustrating in the second half for us not to crush Subi.
"Having said that, it was a pretty convincing win and there's so much more upside to that performance."
Four-times WAFL premiership mentor Micale said his players' inaccuracy was an area they could improve.
"We kicked 4.13 in the second half and, to a big extent, it comes down to accuracy," he said.
"We went inside 50 60 times, from what I'm being told.
"That's a very high percentage, so their work rate was very high. I think our efficiency once we got it inside the forward 50 was pretty high because we went about 67 per cent.
"Unfortunately our accuracy was the thing that let us down."
Fremantle player Zac Clarke shone for the winners, combining with Sandover Medal favourite Paul Johnson to give the Royals a clear dominance at the ruck contests and around the ground.
Long-time West Coast assistant Micale said Clarke had done every- thing he could to earn an AFL recall.
Clarke finished the game with 26 possessions, six marks, 30 hit-outs, eight clearances, four inside 50s and a goal in an impressive all-round display.
"Zac was very good on the ball and around the ground and he played with intensity, which was pleasing to see," Micale said.
"You look at his performance today and his form is good enough to play AFL if he can get the opportunity and the balance is right at Fremantle."
East Perth full-back Kyle Anderson claimed another big-name scalp, restricting out-of-favour Docker Jack Anthony to six possessions, three marks and 0.1.
Midfielders Nick Kommer, Freddie Clutterbuck and Garry Moss played key roles for the Royals, Kommer capping his good work with three goals.
Co-captain Michael Swan, Josh Smith and Mat Seal booted three goals each. Swan was playing in his first game since the shock death of his mother in Bali earlier this month.
Emerging Lions midfielder George Hampson tried hard to lift his side with support from key defender Aidan Parker, tagger Pat Hassett, teenage forward Chris Deluca and tall utility player Clancy Wheeler.
Clarke's Fremantle teammate Antoni Grover had a dirty day for Subiaco, reported in the opening minutes for misconduct after allegedly headbutting opponent Adam Prior.
Prolific midfielder Jason Bristow (back) joined an ever-swelling Lions injury list, taking no part in the match after half-time.