Yorkshire duo Brook and Root (119) shared a fourth-wicket partnership of 201 in their division two clash at Headingley on Saturday, underpinning their county's first-innings 5-450 declared against Derbyshire, with Brook top-scoring on 126 not out.
But veteran Wayne Madsen, who left the field on Friday nursing his right hand and went to hospital for treatment, compiled an excellent unbeaten 88 as Derbyshire responded on 3-190.
Duckett's dazzling double century helped put Nottinghamshire in control against Warwickshire in their division one match at Edgbaston.
The left-hander's chanceless 218 lifted Nottinghamshire to 400 all out against an attack skilfully led by Olly Hannon-Dalby, who took 5-78, before the visitors struggled to 3-71 on a rain-ruined day.
Contrasting hundreds by captain Rory Burns and Jordan Clark put champions Surrey in control against Hampshire, before Anglo-Australian Dan Worrall again came up trumps with an important wicket.
Burns' seven-hour 113 - his 25th first-class century but first since July 2022 - laid strong foundations before Clark smashed a run-a-ball unbeaten 106 as Surrey made 359 for a first-innings lead of 208.
The in-form Worrall then struck, trapping opener Ali Orr leg before as Hampshire stumbled to 2-31 by the close.
A century by Feroze Khushi and Nick Browne's unbeaten 94 enabled Essex to take control of their match against Durham.
Replying to the home side's 358, the county championship leaders were 3-314 at the close, leaving their side just 44 in arrears.
Australian Test opener Marcus Harris was caught behind for a five-ball duck for Leicestershire as they struggled against Northamptonshire in division two at Leicester.
George Bartlett posted his maiden hundred for Northants in their 7-453 before, on a rain-interrupted day, the home side moved to 2-97.
14°C