A review of Saturday's action from the Specsavers County Championship.
Yorkshire's batsmen, led by centurion Gary Ballance in partnership with Tom Kohler-Cadmore, secured the early advantage during a hard-fought opening day against Specsavers County Championship leaders Somerset.
Yorkshire ended the day on 282 for three from 96 overs, with Ballance (111) and Kohler-Cadmore (77no) batting from late morning until late evening as they shared 199 inside 62 overs.
Ballance fell to Tim Groenewald three overs from the end - caught at second slip by Jamie Overton for Groenewald's 400th first-class wicket.
Warwickshire bowler Will Rhodes sliced through the Essex order with four wickets in 26 balls either side of tea to claim career-best bowling figures of five for 17 at Chelmsford.
Alastair Cook and Dan Lawrence had put on 116 for the third wicket before Rhodes had both batsmen back in the pavilion in quick succession to kick-start a major collapse from 157 for two to 171 for six.
Essex revived belatedly but were dismissed for 245 just before the close.
Ravi Ashwin ripped through Surrey's batting line up with six wickets for Nottinghamshire against the ailing defending champions at Trent Bridge.
The home side's trio of slow bowlers - led by the mercurial Ashwin - dismantled the Surrey batting line-up on the first day of their meeting.
Ashwin claimed figures of six for 69, with Liam Patterson-White bagging three more and Samit Patel removing Scott Borthwick as Surrey were bowled out for 240.
Nottinghamshire, bottom of the table and without a win in any of their last 16 championship matches, reached the close on 20 for the loss of Ben Slater.
Felix Organ celebrated his maiden first-class century as Hampshire ended on top against Kent.
Academy graduate Organ, on just his third Championship appearance, showed a delightful mixture of defensive resolve with a pinch of flair to score exactly 100 and was well supported by Ian Holland (60) and Rilee Rossouw (92).
But despite Hampshire bossing the day, evening wickets with the second new ball gave Kent rewards for their toils as the hosts ended the day on 340 for six.
Lancashire enjoyed a first day of utter dominance against Sussex, bowling out their opponents for 127 and then making 149 for one in reply.
Matthew Parkinson collected a career-best six wickets for 23 from 15.2 overs and Australian Glenn Maxwell picked up four for 41.
Alex Davies then made 72 before becoming the only Lancashire wicket to fall and Keaton Jennings was unbeaten on 53 at the close.
Worcestershire had the better of a rain-interrupted first day against Durham, reducing the hosts to 122 for six.
Joe Leach and Charlie Morris were on point with the ball in the morning session, taking two wickets apiece as Durham slipped to 47 for six before staging a recovery between the rain showers.
Tom Helm claimed four for eight as Middlesex took control against Glamorgan, leaving the home side on 25 for four after being bowled out for 384.
Dawid Malan scored his fourth hundred of the season as his superb 166 helped Middlesex recover from 131 for six.
Malan put on 95 with Toby Roland-Jones (54) and 141 with Nathan Sowter (57no) to eke out a competitive score.