Sydney-born Sam Robson has compiled a mammoth career-best 253 and Robbie White reeled off his second successive century as Middlesex racked up the highest total in their long county championship history.
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White was unbeaten on 110 when Middlesex declared on 5-676 on day two of their match against Sussex at Hove on Tuesday.
It was the sixth-highest total Sussex had ever conceded, the greatest for 21 years, but openers Tom Haines and Ali Orr enjoyed benign conditions too, taking their side to 103 without loss at stumps.
Much of the day had been spent ticking off records as Middlesex, who had resumed on 2-400, batted Sussex out of the game.
Dual national Robson, the former England Test batsman who'd been raised in New South Wales and played at national under-19 level for Australia, moved to his double hundred in the sixth over of the day with a boundary off Henry Crocombe.
He then accelerated, with his next 50 runs coming off 55 balls and taking him past his previous best of 231, against Warwickshire in 2013.
It was a mild surprise when he tried to hit off-spinner Jack Carson through mid-wicket and gave Haines, running across from mid-off, a catch. Robson had faced 356 balls and hit one six and 30 fours.
Middlesex ploughed on, going past the previous county high of 3-642 against Hampshire at Southampton in 1923.
Just before tea, White, who made his maiden century against Derbyshire at Lord's last week, took a boundary off Haines to reach his 100.
Elsewhere, Essex consolidated their position at the top of division two with an innings and three-run victory over Gloucestershire at Chelmsford.
Off-spinner Simon Harmer moved to 49 Championship wickets for the season to finish with four for 78 as Essex wrapped up the five dismissals needed on day four before lunch.
Gloucestershire were bowled out for 197, as Sam Cook claimed 3-31 in his 20.1 overs, with Ryan Higgins (38) eventually run out.
There was also an early result in Canterbury, where Kent beat Worcestershire by an innings and 56 runs in their division three match at the Spitfire Ground.
Nathan Gilchrist, Grant Stewart and Darren Stevens took three wickets apiece to dismiss the visitors for 204 in their second innings after resuming at 6-91.
Australian Associated Press