Varun Chopra's century proved crucial as Warwickshire Bears clinched a second Clydesdale Bank 40 final appearance in three years with a resounding semi-final win by 23 runs over Lancashire Lightning at Old Trafford.
A candidate to be England's new Test opener, Chopra anchored the 2010 winners' score of 250 for six with 110 off 124 balls, including nine fours and a six.
Lancashire then crumbled to 90 for five in reply as they went on to lose for the first time in seven matches at Old Trafford this season, setting up a Lord's final between Warwickshire and Hampshire on September 15.
This was also Lancashire's 11th semi-final defeat in the last 12 in all forms of limited-overs cricket as they were bowled out for 227 with two balls left.
New ball bowler Neil Carter excelled with four for 38, while Paul Horton top-scored for the hosts with 78 off 63 balls.