England's one-day wicketkeeper Craig Kieswetter smashed a lively half-century to help steer Somerset to a 60-run victory over Scotland at Taunton.
Kieswtter hit eight fours and a six in his 56 to help the hosts to 206 all out after winning the toss, Jos Buttler making 32.
In reply Scotland were soon 31-4 as Alfonso Thomas and Jamie Overton grabbed two wickets each with the new ball.
They were eventually bowled out for 146, Richie Berrington top scoring with 40 and Craig Meschede taking four for 27.
Kieswetter handed over the pads to Buttler when Scotland batted so he could bowl his occasional off-spin on a pitch that offered some turn.
He came on for the 28th over with the score 113-7 and conceded 19 from two overs, taking the wicket of Craig Wallace, caught at long-off.
It was Kieswetter's third wicket of the season after claiming two at the end of an LV= County Championship match at Worcester.
Somerset had looked on course for a big total when openers Kieswetter and Nick Compton (23) took the score to 70 in the 13th over before Compton was caught behind off Davey, and although they continued steadily the score could have been bigger.
Scotland looked to be recovering from the poor start to their innings when Mommsen and Berrington added 41 for the fifth wicket before Mommsen was bowled for 12 aiming to hit Meschede out of the ground.
It was Meschede who ended Berrington's resistance with the total on 100 as he holed out to George Dockrell at long-on. At that point the visitors required 107 from 15.1 overs.
It never looked on. Ryan Flannigan did his best with 30 not out, but in a losing cause.