Teenager Tom Norton claimed a sensational hat-trick on his Rothesay County Championship debut to help Glamorgan fight back against Somerset at Sophia Gardens.
Somerset built a 125-run first innings lead having dismissed the hosts for 229, only for Norton to take the plaudits after becoming the first player in 120 years to a claim a hat-trick on his County Championship debut.
Norton removed opener James Rew for a duck in the fifth over, which was followed by the wickets of Tom Lammonby and then Archie Vaughan in the following deliveries to reduce the visitors to 7-3.
Will Smeed also fell to Norton in the final over of the day as Somerset laboured to 32-6 at the close, a lead of 157, with Ryan Hadley (2-3) also impressing and Tom Abell ending the day unbeaten on 15.
England Test captain Ben Stokes was dismissed for just 14 as he continued his return for Durham in their Division Two clash at Worcestershire.
Stokes had taken two wickets on the opening day in his first outing since the Ashes, but saw hopes of making a solid innings with the bat come up short as he was out for 14 from 17 balls, edging 20-year-old Jack Home to second slip.
Worcestershire had earlier pushed on from 209-7 to reach 308 all out, with Home having contributed a determined unbeaten 63. Durham ended 207-6, with David Bedingham making 83 and Graham Clark 48 not out.
England white-ball captain Harry Brook missed out on a half-century as Warwickshire fought back against Yorkshire in their Division One match at Edgbaston.
Brook, slotting into the side in place of the resting Joe Root, had resumed on 29, but could only reach 40 before he was bowled by Ethan Bamber.
Yorkshire, at 110-4 overnight, swiftly collapsed to 152 all out. Olly Hannon-Dalby finished with four wickets - including skipper Jonny Bairstow for a run-a-ball 25 - and Jordan Thompson taking three in a blistering 4.2 over spell.
Warwickshire ended the day at 267-3, after half-centuries from Rob Yates (81) and Dan Mousley (70).
Jimmy Anderson took four wickets for Lancashire against Middlesex at Old Trafford, finishing with 4-67 in 16 overs as the visitors were dismissed for 169. Lancashire finished the day on 45-3, leading by 77 runs, with all three wickets taken by Ryan Higgins.
Defending champions Nottinghamshire posted 415 in their first innings against Surrey at Trent Bridge. Centurion Joe Clarke could not add to his overnight 129 as he was caught behind before Surrey eventually got the last two wickets, with veteran seamer Dan Worrall finishing on 6-73.
Surrey went on to reach 211-4 in reply after half-centuries for Dom Sibley (77) and Dan Lawrence (52 not out).
At Chelmsford, Simon Harmer produced an unbeaten 80 to add late runs for Essex, who reached 273 all out against Hampshire. Nick Gubbins (35 not out) helped the visitors to 58-2, a lead of 20.
Dan Hughes (136) hit a century for Sussex against Leicestershire at Hove. John Simpson was unbeaten on 89 in the home side's 386-8 which put them into a 58-run lead.
Elsewhere in Division Two, Kent trail Gloucestershire by 17 runs at Bristol. Zak Crawley was out for one before Ben Dawkins (65), Ben Muyeye (90) and captain Daniel Benjamin's unbeaten 74 pushed Kent on to 308-8.
Derbyshire piled on the runs against Northamptonshire, reaching 604-7 declared with Martin Andersson (104) and Brooke Guest (141) both making centuries. Northamptonshire were 98-4 at stumps.
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