Sixth at last week's Australian PGA Championship, Micheluzzi continued his hot form with a seven-under-par 63 at Victoria Golf Club to set a cracking early pace on Thursday.
The Victorian rolled in eight birdies and dropped his only shot of the day at the par-four 10th hole in a statement showing two days after venting his rankings frustrations on social media.
In no uncertain terms, Micheluzzi pointed out how he picked up double the amount of rankings points for finishing ninth at the 2021 Australian PGA Championship than he picked up for placing sixth last week with world No.3 Cameron Smith in the field.
"WTF is this shit!," he posted on Twitter.
Even Tiger Woods this week called for a rankings overhaul as golf officials grapple with how to deal with the emergence of the Saudi-backed LIV tour that has so dramatically shaken up the sport.
Taking advantage of the benign morning conditions, Micheluzzi was clearly a man on a mission as he reeled off birdies at the second, fourth, fifth, ninth, 12th, 13th, 17th and 18th holes.
"I'm not going to even mention about the world ranking points," he said post-blitz.
"Everyone knows what I think of it. Good golf takes care of itself."
Fellow Australians Connor McKinney and Zinyo Garcia signed for 67s at neighbouring Victoria, the other sandbelt course co-hosting the Open to be tied for second at three under.
American Gunner Wiebe carded a 69 at Kingston Heath to also sit at three under.
With seven birdies, Adam Scott somehow scraped together a one-under 71 despite racking up four bogeys and a dreaded double in a wild opening round.
Men and women are sharing the fairways at a national championship for the first time anywhere in the world.
As such, a second cut will be introduced after Saturday's third round to reduce the two fields to the top-30 players and ties, leaving Scott to note on tournament eve it was imperative to play well over the first three rounds.
But Australia's only ever Masters champion is already playing catch-up, six shots behind Micheluzzi.
Respective men's and women's tournament favourites Cameron Smith and Minjee Lee were among a raft of stars featuring in first-round afternoon action.
Bidding for a sixth victory of a stellar year, Smith is also chasing the first Australian PGA-Australian Open title double since Greg Chalmers achieved the rare feat in 2011.
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