Derbyshire 65 for 1 (Reece 39*) trail Northamptonshire 219 (Zaib 90, Andersson 2-28)

Zaib found fine support from Justin Broad in a partnership of 73 in 19 overs which enabled the hosts to post 219, a score that had looked extremely unlikely at 89 for 6 soon after lunch.

For only the second time in Derbyshire history all seven bowlers used took a wicket, Zak Chappell, Martin Andersson and Jack Morley taking two apiece. Luis Reece and Brooke Guest then saw the visitors through to 65 for 1 at the close, trailing by 154 runs, Broad taking the one wicket to fall.

Playing on the same surface used for last Thursday's Vitality Blast quarter-final and one expected to offer turn, the hosts opted to bat first in overcast conditions after winning the toss. Playing with a rejigged batting line-up, the gamble seemed not to have paid off as wickets tumbled although Northamptonshire's spinners would have drawn encouragement from the turn found by their Derbyshire counterparts.

India international Prithvi Shaw was first to go when he edged the second delivery of the day from Chappell to third slip, the bowler's 50th first-class wicket for Derbyshire. Home skipper Luke Procter, who played two textbook drives through mid-off, was then trapped leg before wicket by Reece before Gus Miller, promoted to open, was undone by an Andersson delivery which swung back in to also pin him lbw.

Rob Keogh's stay was equally brief, Andersson moving one away and drawing the edge, keeper Guest taking an excellent diving catch.

James Sales played some attacking shots, slapping Andersson through the covers and smashing Reece over the head of mid-off for another boundary. His was the fifth wicket to fall before lunch though when he drove loosely to Chappell and was caught low down at third slip by Aneurin Donald.

Lewis McManus started positively after lunch, driving Chappell down the pitch for four but became teenage quick Harry Moore's maiden first-class wicket on Championship debut, courtesy of a pull straight to fine leg.

That brought together Zaib and Broad together who began to restore a measure of respectability to the hosts' innings. Zaib worked Reece through square leg for four before lunch and eased into a glorious cover drive off Moore after the interval, while Broad drove Chappell down the ground and punched him through the covers as Northamptonshire passed 100 in the 37th over.

As Derbyshire deployed spin from both ends, Alex Thomson immediately found some turn to pose Broad some challenges before the allrounder swept him to the ropes. Zaib meanwhile also found the sweep an increasingly lucrative bet against the spinners.

The pair took Northamptonshire past 150 up in the 50th over before Morley spun one away from Broad, drawing the edge with David Lloyd taking a good low catch at second slip. Ben Sanderson fell quickly in the next over, offering short leg an easy catch when he prodded forward against Thomson.

Zaib though progressed serenely to his half-century, reaching the milestone off 100 deliveries as he played Thomson through midwicket. He survived a strong shout for a catch at short leg off Morley when the umpires adjudged the ball had been hit into the ground first. Zaib responded by dispatching Morley imperiously over long-off for six and powering Thomson through extra cover.

But Morley then picked up a second wicket when he turned one back in to hit Dom Leech's leg stump as he attempted to sweep.

With Northamptonshire nine wickets down, Zaib pressed the accelerator, clubbing Morley's left-armers through mid-off and then sweeping him high over deep square for four and six. His downfall finally came was stumped coming down the pitch to Lloyd.

When Derbyshire began their innings after tea, Sanderson bowled a typically miserly spell from one end, Broad making the initial breakthrough from the other. He found some additional bounce from back of a length, surprising Harry Came who was caught on the crease, fending fended the ball to Sales who took a good low catch at second slip.

Reece meanwhile started to find the boundary, cutting Broad crisply to deep point, while he and Guest both pulled Yuzvendra Chahal fluently for boundaries as Derbyshire finished the session without further incident, despite some strong appeals from the hosts' spin contingent.