Sidebottom and Northeast star
Ryan Sidebottom claimed seven wickets for Yorkshire in County Championship Division One on Sunday, while Sam Northeast hit 91 for Kent.
Sidebottom rolled back the years as Yorkshire claimed the upper hand on day two of their Division One clash with Middlesex at Scarborough.
After Yorkshire had lost their final four wickets in quick succession early on to be bowled out for 253, Sidebottom was soon causing major problems as he sent back Chris Rogers, Eoin Morgan and Paul Stirling to help reduce Middlesex to 11 for four.
John Simpson (110) and Dawid Malan (78) then staged a magnificent recovery to guide their side to 179 for four and seemingly on course for a first-innings lead - only for Sidebottom to hit back again.
The former England left-armer made the key breakthrough with the dismissal of Malan before then also sending back Ollie Rayner, Toby Roland-Jones and Tim Murtagh to finish with figures of seven for 44 as Middlesex were bowled out for 232.
That gave title hopefuls Yorkshire an unexpected first-innings lead of 21, which they then added to, reaching stumps on 29 for the loss of Adam Lyth's wicket.
In Division Two, Sam Northeast hit 91 to spearhead Kent's 351 for seven after they were put in by promotion rivals Surrey at Guildford.
Northeast, who has revived his season since being dropped for a fortnight last month, received good support from Sam Billings (57 not out) and Ben Harmison (48) as Kent batted themselves into a strong position at the end of day one.
It was the bowlers on top at Derby with Glamorgan being dismissed for 138 before Derbyshire were reduced to 142 for six in reply.
Alex Hughes (four for 46) and Tony Palladino (three for 14) did much of the damage as Derbyshire made the most of winning the toss and sending Glamorgan in, with only Murray Goodwin (44) and Mark Wallace (30) getting beyond 14.
In reply, Wes Durston, with a quickfire 50, and opener Ben Slater (40) helped Derbyshire edge into a narrow lead which they will hope to build on significantly on Monday as they attempt to move away from the bottom two in the division.