Kent vs Somerset
Nathan Gilchrist, who picked 5 for 55, will be on a hat-trick come the second morning in Canterbury. The first day saw Somerset opt to bat and slip to 9/3 as Kent's Gilchrist and Matthew Quinn ran havoc with the new ball. Lewis Goldsworthy's 93 not out kept the runs ticking on a challenging day but another late flurry of wickets saw Somerset collapse from 195/6 and go to Stumps on Day 1 at 195/9.
Lancashire vs Surrey
Lancashire's 414/5 on opening day was largely thanks to Keaton Jennings, who scored 190 not out against champions Surrey and became the highest run-scorer of this county season in the process. Jennings first added 195 for the third wicket with Steven Croft (86) before flourishing in an unbeaten 110-run stand for the sixth wicket with George Balderson.
Northamptonshire vs Essex
An unbeaten stand of 68 between Tom Westley (55*) and Ben Allison (37*) meant that Essex went to Stumps on Day 1 at 220/8 after being put in to bat. After a good start through a 76-run opening stand, they were in a shaky position at 96/4 and then 152/8 as Tom Taylor (3-39) had a field day alongside Ben Sanderson and Jack , both of whom picked two each.
Warwickshire vs Hampshire
Only 41 overs were possible on the opening day but Robert Yates (77*) and Dom Sibley (54) ensured that Warwickshire finished the day strong at 138/2 in a must-win encounter. Put in to bat, the openers added 129 before Sibley became one of Ian Holland's two wickets.
Yorkshire vs Gloucestershire
A four-wicket haul from Matthew Fisher blew away Gloucestershire for 190 after opting to bat, with James Bracey's 71 and Tom Price's 38 being the only scores of note in the innings. In response, Adam Lyth scored 44 at the top of the order for Yorkshire who went to Stumps at 80/3 on Day 1.
Glamorgan vs Sussex
A sparkling unbeaten 91 from young India batter Shubman Gill was the highlight of Glamorgan's batting performance on the first day against Sussex. Opting to bat, the visitors found life comfortable with Hove producing another typically easy-paced batting surface. Openers David Lloyd and Eddie Byrom got off to a rapid start - the former even getting to a brisk fifty but he failed to capitalise on that platform. Gill scored at a very fast clip, sharing useful partnerships with Lloyd and Sam Northeast. Billy Root then gave Gill company as the pair added an unbroken 70-run stand on a rain hit Day 1 in which only 41.3 overs were possible, with Glamorgan managing 221/3.
Nottinghamshire vs Durham
A gritty 180-run stand for the second wicket between Haseeb Hameed and Matthew Montgomery helped Nottinghamshire to take the first day's honours against Durham at Trent Bridge as they finished with 276/2. Opening the innings, Hameed stitched a solid stand with fellow opener Ben Slater. However, Slater couldn't consolidate on the start and fell prey to Raine. Hameed got stuck in and found an able partner in Montgomery as both struck fine centuries. Hameed in particular was at his fluent best, finding the boundary 17 times in his 171-ball vigil. He appeared set for a much bigger score before being nipped out by Matty Potts. Montgomery then worked his way to the deserved milestone and saw off further damage in the company of Joe Clarke.
Worcestershire vs Middlesex
Opting to bowl under favourable overhead conditions, Middlesex's seasoned new-ball duo of Tim Murtagh and Toby Roland-Jones shared five scalps between them to leave Worcestershire tottering at the end of the opening day at New Road, Worcester. The home side, boasting of some fine batters including Pakistan veteran Azhar Ali, failed collectively with only skipper Brett D'Oliviera offering a semblance of resistance. Few others, including Ali, got starts but nobody was willing to play the waiting game in tough batting conditions. For Middlesex, Murtagh and Roland-Jones were on the money from the get-go, and the duo found able support from the other two seamers. Bad light brought a premature end to the day's play with the tourists well in front as they reduced Worcestershire to 167/8.
Leicestershire vs Derbyshire
A five-wicket haul from 23-year-old pacer Samuel Connors helped Derbyshire restrict Leicestershire to a modest total of 249 on the opening day at Derby. Ben Aitchison bagged three of the first four wickets, making regular inroads to prevent a partnership from kicking on. Quite a few of the visiting batters managed to get in but weren't able to kick on. Connors relished the conditions on offer and sliced through the middle/lower order to peg Leicestershire back. If not for a valiant fifty from Tom Scriven, the score would have looked worse. Derbyshire's openers saw off the 16 overs left in the day with both Godleman and Luis Reece appearing to be in reasonable comfort as they went into Stumps at 57/0.