The second day of the three Division Two County Championship matches took place on Monday, and batsman were generally on top following a day of sunny conditions up-and-down the country.
Leicestershire's new-look batting lineup faired well in Cardiff against Glamorgan, meaning they should reach parity in the first innings against their hosts.
In Hove, despite dismissing the England captain Alastair Cook for just one, Sussex failed to nail down their position of strength against Essex, and in Bristol, Gloucestershire's reply to Derbyshire's 444 has started well thanks to Chris Dent and Cameron Bancroft.
O'Brien hits 93 as Leicestershire head towards parity in Cardiff
After dismissing their hosts for 348 on day one at Sophia Gardens in Cardiff, Leicestershire's batsmen had a solid day to fire last season's bottom-club to 297-6 at the close on day two.
Following an opening partnership of 89 was broken when Angus Robson was dismissed by Michael Hogan for 25, a mini-collapse occured with Neil Dexter (4) and skipper Mark Cosgrove (0) losing their wickets cheeply as the visitors fell to 99-3.
Paul Horton continued to flourish at the other end, with his debut innings for the club eventually ending on 67, before handing the reigns to Niall O'Brien who put together the main innings of substance for Leicestershire playing his way to 93 off 134 balls before he was dismissed by Graeme Wagg.
The middle-order performed well alongside O'Brien, with another debutant Mark Pettini hitting 27, before Wayne White (42 not out) and Ben Raine (8 not out) took Leicester to the close still trailing by 51 on first innings.
Westley helps Essex recover with 86 after Cook falls for one
Following his century in the opening game of the season against Gloucestershire, Alastair Cook had hoped to continue his fine form, but it wasn't to be as he was dismissed for just one early on day two in Hove.
The England captain was caught by Sunday's centurion Chris Nash off the bowling of Steve Magoffin, facing up to just his fifth delivery of the morning.
That put Essex instantly on the back-foot, but Tom Westley's 86 helped them back into the contest, with Jesse Ryder's patient 51 also crucial on day two.
Magoffin and George Garton each picked up two Essex wickets, as they ended the day on 252/7, still 108 behind their hosts first innings effort.
Madsen hits 150 to help Derby post 444 before Glos openers lead fightback
Having scored a century on his Derbyshire debut against the same opposition seven years ago, Wayne Madsen added more good memories to his time playing Gloucestershire, with an extremely well-made 150 at the County Ground in Bristol.
Madsen shared in a century partnership with Tom Poytnon (53) on day two which led Derbyshire to an imperious 444 in their first innings, albeit coming off of 157.1 overs taking a lot of time out of the game.
Liam Norwell and Jack Taylor each took four wickets for Gloucestershire, with Taylor's 4-61 the best of his career to date.
In reply, openers Chris Dent and Cameron Bancroft shared an opening stand of 102, before Bancroft fell for 41 just before the close of play when he was bowled by Shiv Thakor. Dent ended the day unbeaten on 61 alongside nightwatchman Norwell who will resume day three on two not out.