Adam Finch picked up two wickets during an impressive spell, but a Worcestershire X1 went down by 20 runs under the Duckworth-Lewis Method against Shropshire at Bridgnorth.
Finch, who had a successful loan period at Surrey last summer, took the new ball after Shropshire were put in and picked up wickets in his second and third overs.
He had Harry Chandler (3) caught behind by Alex Milton and then dismissed Will Parton (10), who was caught at mid-off by skipper Ross Whiteley.
Finch bowled six overs in his first spell and ended with overall figures of 10-1-36-2.
There were other successful performances from Ed Bragg, Mitchell Stanley and Josh Baker and Shropshire were reduced at one stage to 76-5.
But then Ryan Lockley came to the wicket and dominated the remainder of their innings with an unbeaten 81 from 96 balls with one six and six fours.
He added 38 for the ninth wicket with Matty Symonds (11) and an unbroken 35 for the tenth with Sam Whitney as Shropshire totalled 223-9 in their 50 overs.
Stanley ended with figures of 10-1-45-2, Bragg 8-0-41-3 and Baker 10-0-35-2.
Worcestershire lost early wickets in reply and were 54-4 at one stage despite 35 off 43 balls with one six and four fours from Josh Dell.
Whiteley (20 not out), who has been in excellent form with the Seconds, and Henry Cullen (17 not out) put on an unbroken 34.
But at 88-4 from 21 overs, the rain fell, and the players did not return to leave Shropshire the winners under the D-L Method.