Rory Burns fell just one run short of a double-century as Surrey smashed a host of records in heaping a mammoth total of 626 for six on Gloucestershire in Bristol.
Burns was not alone in falling short of a personal milestone, with Zafar Ansari ousted two away from a maiden first-class century in LV= County Championship Division Two action.
Burns' 199, Ansari's 98 and Jason Roy's red-hot unbeaten 121 from just 71 balls were all new first-class personal bests.
Spin-bowling all-rounder Ansari followed up his 77 not out and 62 against Worcestershire at The Oval at the start of the month with another fine knock, surpassing his previous best of 83 not out.
Burns eclipsed his previous top score of 121 as the visitors applied a constant chokehold - and then Roy hammered past his 106 not out highest knock without consummate ease.
Vikram Solanki also fired 143 as Surrey refused to be contained in the West Country.
Gloucestershire's 112 all out is a mere speck on the County Ground horizon after two days, given Surrey's 514-run lead.
Ansari proved the day's first dismissal, just two runs shy of that maiden first-class century, with Alex Gidman holding the catch from Benny Howell's bowling.
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South Africa's new Test skipper Hashim Amla was unable to force a start, trapped leg before by Will Gidman for just nine.
Surrey breezed away from leaking two wickets for 12 runs, Burns ticking along at a solid rate and new partner Solanki raising the pace.
The vastly-experienced 38-year-old blasted his century from just 112 balls as the visitors showed their superiority.
Burns and Solanki put on 212 for the third wicket as Surrey seriously ratcheted up proceedings.
Not content with his first score of 150, Burns quickly honed in on a double century.
Just as he was lining up his celebrations though, Liam Norwell had him caught by Alex Gidman, just the one agonising run short.
Unsatisfied with 439 for three, greedy Surrey kept on dismantling the Gloucestershire attack.
Steven Davies fell to Will Gidman for nine, but Solanki moved on to 143 before he was removed by Matt Taylor.
Sensing a slog-fest, Roy stepped into the fray and produced the innings of the day, where the hitting was concerned at least.
His howitzer hundred came from just 55 balls and 67 minutes, including nine fours and seven sixes.
Gary Wilson then hit 26 before he was clean bowled by Norwell, with Gareth Batty four not out at the close.