|Royal London One-Day Cup, Edgbaston|
|Worcestershire 115: Barnard 38, Leach 29; Clarke 5-26, Patel 2-27|
|Warwickshire 119-2: Ambrose 54*, Porterfield 37*|
|Warwickshire (2 pts) won by eight wickets|
Warwickshire destroyed Worcestershire with a devastating morning burst at Edgbaston as they won by eight wickets to leapfrog their neighbours in the One-Day Cup group table.
Rikki Clarke took a List A best 5-26, backed by fellow strike bowler Keith Barker, as the visitors' decision to bat first backfired, slumping to 41-7.
Ed Barnard (38) and Joe Leach helped Worcestershire rally to 115 all out.
The Bears took just 22.4 overs to reach 119-2, with Tim Ambrose not out on 54.
Worcestershire won both this season's T20 local derbies, beating the Bears both home and away, and also five of the previous six List A fixtures against Warwickshire, having not lost in this format at Edgbaston since 2007.
But, even without in-form Brett D'Oliveira, who was absent on England Lions duty, they were surprisingly well beaten.
Former England international Clarke's first 'five-for' in one-day cricket was well supported by left-armer Barker, who at one point went 28 deliveries without conceding a run.
At one point, Worcestershire were in danger of failing to reach their lowest-ever one-day total of 58 at home to Ireland in 2009, until the eighth-wicket stand of 60 between Leach and Barnard.
But Oliver Hannon-Dalby got rid of Leach before the visitors were finished off by two wickets for spinner Jeetan Patel, with 15 overs going to waste.
Bears opener Will Porterfield (37*) and wicketkeeper Ambrose (54*) then shared an unbroken partnership of 79, to see their side to a second group win with more than half their overs to spare.
Worcestershire had won two of their first four matches to stand second in the North Group, on five points, but they have now been overtaken by Warwickshire who began the day in seventh place.
The Bears' next game is on Tuesday at home to Northamptonshire, who are scheduled to travel to Worcestershire the following day.
Warwickshire all-rounder Rikki Clarke told BBC WM:
"When you open the bowling in one-day cricket you just try and keep it simple, bowl line and length. I got most of the wickets but Keith Barker bowled really well.
"We talk a lot about the importance of bowling well in partnerships and creating pressure and we did that. A couple of decisions went our way and we got on a roll.
"There was just a bit of nip and a bit of swing to start with but, once the ball got older, it was quite a decent batting wicket as we saw at the end when we chased it down comfortably.
Worcestershire coach Steve Rhodes told BBC Hereford & Worcester:
"Rikki Clarke bowled well, let's not take anything away from him. He swung the ball away and had a nice, angled nip-backer. He made life difficult. He is a quality new-ball, one-day bowler. But we have got to be better than that against him because that's what professional batting is about.
"But there was some indiscipline from our top order. Barny and Joe did their best and put up a reasonable stand but it was never really going to be enough.
"We weren't helped by some tough decisions from the umpires, but that's the rub of the green - sometimes they go for you, sometimes they go against you."