Western Australia, bundled out for 151 in their first innings, were dismissed for 304 in the second on Monday after Victoria had smashed a mammoth 613 for three wickets declared.
At the half-way mark in the six-team domestic competition, Victoria have 20 points six more than Tasmania and Queensland, who share second spot.
Young medium-pace bowler Andrew McDonald completed Western Australia's humiliation, taking 6-67 as the home team just failed to push the one-sided match into a fourth day.
After former Test opener Matthew Elliott had smacked 182, Jonathan Moss (172 not out) and David Hussey (160 not out) piled on the agony for Western Australia in Victoria's first innings romp.
Reigning champions New South Wales failed by just one run to defeat Tasmania outright in a thrilling Shield clash at Sydney Cricket Ground.
Australian Test batsman Simon Katich, needing to hit three runs off the final over of the game bowled by Xavier Doherty, managed just two, leaving the scores level and the match drawn.
"It's very disappointing we didn't quite make it," Katich said.
Needing 176 runs from 22 overs for maximum points, New South Wales went desperately close as they made 175 for three wickets.
Phil Jaques clobbered 85 runs off 60 balls and Michael Bevan (53) played a typically composed supporting role for New South Wales.