|NatWest T20 Blast, 3aaa County Ground|
|Worcestershire 177-5 (20 overs) beat Derbyshire 169-8 (20 overs) by eight runs|
Worcestershire paceman Chris Russell took three wickets from the final four balls to help his side stay top of the North Group with an eight-run win.
Winless Derbyshire looked capable of overhauling the visitors' 177-5, built by skipper Daryl Mitchell's 68 and Colin Munro's 65 from 37 balls.
Wayne Madsen hit 65 from 40 balls and put on 75 with Marcus North (38).
But with 15 needed off the last over, Russell (4-40) removed North, Scott Elstone and Tony Palladino.
After starting the T20 Blast with successive defeats, Worcestershire's fifth straight victory keeps them level on 10 points from seven games with Lancashire, staying top on faster run rate.
But Worcestershire and Lancashire have both played two more matches than every side in the North Group other than bottom side Derbyshire, who have just one point from their first six games.
After this week's County Championship game against Leicestershire, starting at Grace Road on Sunday, Worcestershire return to New Road on Friday evening for this summer's first derby against the Birmingham Bears.
Derbyshire are also in T20 derby action next Friday night, against Nottinghamshire at Trent Bridge following their Championship home game against Surrey.