SIR DONALD BRADMAN, Michael Clarke, Mark Taylor and Matthew Hayden have all reached the magic triple-century milestone.
But only Bradman among those Test greats can lay claim to equalling Jono Dean's incredible feat of pummelling 300 in a single day.
After rising to prominence with a sparkling 51 against the West Indies on Tuesday, the Prime Minister's XI star produced one of the greatest knocks seen in Canberra grade cricket, belting an unbeaten 300 for Queanbeyan in its Douglas Cup match on Saturday.
A hapless Ginninderra bowling attack could only watch in awe as Dean dispatched the ball to all parts of Kippax Oval 2, belting 17 sixes and 21 boundaries in the second-highest individual innings in Cricket ACT first-grade history.
Dean joins Queanbeyan great Peter Solway in the exclusive 300 club. Solway's 339 was made against ANU in the 1989-90 season and remains the benchmark after Queanbeyan stopped the carnage at 7-457 after 88 overs.
Veteran Queanbeyan and Comets all-rounder Mark Higgs described Dean's innings as the best he's seen and hopes his recent run of hot form will translate into higher honours.
''Most of those sixes would have been sixes at any ground in Australia,'' Higgs said. ''He's played good cricket for a long time, but you've got to do it in front of the right people, and I think he's done that at the Prime Minister's XI.
''As much as he's made 300, people will go 'that's what we expect from someone with that ability'.''
Dean followed the advice of retired great Ricky Ponting, who wanted the 28-year-old to make the most of his starts, and played his way in as Queanbeyan went to lunch with only 80 runs.
A steady acceleration followed before Dean teed-off in the final session, rattling off his final century in rapid time.
Ginninderra captain Josh Kentwell lamented missing several chances to send him off, including a tough diving catch on Dean's second ball of the day that went begging, and another opportunity when he was in his 30s.
''I'm a bit shell-shocked,'' Kentwell said. ''He gave us chances early, but all credit to him, he made us pay a few times. I've never seen anyone hit a ball like that before.''
Ginninderra resumes on 0-11.
Dean's incredible knock came on the same day Max Miller hammered the highest grade score in Weston Creek's 40-year history, rattling off a superb 235 for the club's second XI against ANU, and surpassing Cade Brown's 220 against Wests in 2008-09.
Ginninderra will need to shrug off its two-day struggles ahead of Sunday's John Gallop Cup semi with Eastlake at Kingston Oval.
Tuggeranong and Wests/UC renew their rivalry in the other play-off after facing off on Saturday, with Vinesh Bennett scoring a century to leave Tuggeranong 8-245 at stumps.
In other Douglas Cup games, Weston Creek will resume its first innings trailing ANU by 192 runs with eight wickets in hand in an evenly poised match at Stirling Oval, while Eastlake (278) is in a dominant position against North Canberra Gungahlin (5-68).