A brace from Branimir Mikulic got Floreat Athena home against intense rivals Stirling Lions in a memorable match at E&D Litis Stadium which finished 2-1 for the home side.
The Athena man won the match with an injury time header after Stirling's Jamie De Abreu had looked to have snatched a point for the Lions in the final stages.
Western Knights continued their unbeaten run with a comfortable 2-0 victory over Football West Premier League newcomers Balcatta at Grindleford Reserve.
Goals from Anthony Campbell and David Micevski were enough to see Paul Price's side over the line in a game the coach described as his team's "best performance of the season."
There may have been no goals scored but Cockburn City and Sorrento contested an enthralling match at Percy Doyle Reserve on Saturday afternoon.
Both sides rued missed opportunities in front of goal in a match fitting the expected tight battle between the seventh and eighth-ranked sides heading into round six.
Substitute Jamie Watt fired home a penalty with 13 minutes remaining to earn ECU Joondalup a point in a see-sawing encounter against Armadale at Edith Cowan University that finished 3-3.
Marlon Ramirez cancelled out Scott Bushby's early strike for the hosts, then the impressive James Robinson put Armadale in front, only for Phil O'Callaghan to level.
Substitute Michael Ord gave the advantage back to Armadale 3-2, before Watt ensured both teams left with a share of the spoils.
Perth had to grind out a hard fought come from behind 2-1 win over Mandurah thanks to the heroics of Mandurah's goalkeeper Phil Straker in the round's evening clash at Hyundai Stadium.
Although Mandurah had some good chances in the match it was Straker, with three magnificent saves, that kept the score line respectable.
Mandurah took an early lead through Jordan Rhodes, but goals from Perth's Andreas Oliveira and Dom De Felice got the reigning champions over the line.
Both sides took a share of the spoils as Inglewood United and Swan United fought out a dour 0-0 draw at the 6PR Stadium on Saturday afternoon.
There were few clear cut chances as both struggling sides cancelled each other out, the best falling to Swan defender David McNally, whose header was superbly saved by Oliver Taseski late in the second half.
Match highlights of Floreat Athena versus Stirling Lions and Mandurah City against Perth SC can be seen on www.footballwest.tv from Monday afternoon.
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