Pinjarra's batsmen tallied the Peel Cricket Association's biggest score of the season when they took Shoalwater Bay's bowlers to task on Saturday afternoon.
Led by a stunning league-high individual score of 152 from opener Josh Smith, the Tigers recorded a frightening 4/409 from their 50 overs, going at a clip of more than eight runs per over.
Smith was dazzling in the victory, as he and Jamie Lee took little time getting runs on the board.
His 152 came from just 100 deliveries, as he smashed a whopping 21 boundaries (nine sailing over the cones for maximums), while Lee dashed his way to 49 off 25 before he was bowled by Nicholas Ranford.
Smith then teamed up with Alex Roberts (59) for a 193-run partnership.
He was eventually caught out leaving Pinjarra sitting pretty at 2/271, with a further unbeaten 69 from Matt France and 43 from Jason Poolman eventually seeing them break the 400 mark.
Shoalwater Bay's grim outlook darkened further when Seb Websdale went for a duck to leave them 1/1, and they were never able to come within a sniff of Pinjarra's mighty score.
Jordan Hodgetts was fantastic with the ball for the Tigers, claiming 5/29 as the Seals fell on 138 runs.
The win cements Pinjarra's status as minor premiers, as they currently sit three games clear of the second-placed Waroona with two rounds left on the schedule.
Waroona makes light work of Swans
Waroona chased down their opponents' total in less than nine overs for the second straight week on Saturday, as they cruised past Warnbro.
Mitchell Smith (3/18), Keren Ugle (2/4), Dan Abel (2/7) and Zach Elliott (2/11) all took multiple wickets in an effort that restricted the Swans to just 47 runs from 28.4 overs, a total the Warriors would have no drama chasing down.
In fact, they didn't even lose a wicket, with openers Nic Rep (36) and Jayden Derosa (10) getting the job done in just a click more than eight overs.
Waroona will now enter a top-two battle against Pinjarra next week.
Halls Head cause boilover against Singleton
Lewis Starbuck's four-wicket haul spearheaded an unlikely win for Halls Head as they toppled Singleton.
Starbuck finished with 4/32 in a performance that helped restrict the Irwinians to just 138 runs, with Brad Ranford's 40 runs top-scoring for the team before a collapse in the back end of the order saw them all out after 38 overs.
From there Michael Chappell was able to propel Halls Head to victory, scoring 46 runs as his side just snuck away with a win with less than three overs remaining in the game.
Baldivis survive South Mandurah scare
South Mandurah fell just short in their effort to overcome the White Knights, dropping 10 runs shy of their target.
Batting first, Baldivis was buoyed by 65 runs from Daniel Freemantle, but Corey Tregenza (3/28) helped the Falcons find some regular wickets, with the White Knights eventually dismissed on 150.
Brad Holmes did what he could to help South Mandurah with a prolific 76-run knock, but he received little support from the rest of the order.
Things came down to the wire with the Falcons needing 10 runs with plenty of time to get it, but they eventually ran out of wickets with Baldivis taking the win.