IMPRESSIVE centuries from openers Graham Clark and Alex Lees helped Durham ease over the line against Kent Spitfires on the opening day of the Royal London Cup.Clark hit a career-best 141 from 119 balls while Lees hit 100 from 98 balls as Durham recorded their highest ever 50-over total with 405-4, though there were four dropped catches during their opening partnership.There was also an impressive 60 not out off 37 balls from Australian batsman Cameron Bancroft.And their bowling performance started just as well, with Chris Rushworth taking the opening three wickets in the first s...