London: Yorkshire's Australia star Darren Lehmann found himself in the unusual position of merely playing a supporting role for his county as it crushed Somerset by eight wickets in the quarter-finals of the Benson and Hedges Cup at Taunton on Wednesday. The South Australia left-hander faced a mere 60 balls and struck six fours in his unbeaten 51 but was the junior partner in an unbroken stand of 140 with England number three Michael Vaughan, who finished 125 not out. With a number of international players on show Vaughan seized the limelight. England's number three proved the most prominent of the Test contingent, with 18 fours and a six during his 128 ball innings. Not even Somerset's England fast bowler Andy Caddick, man-of-the-match against Pakistan at Lord's last week, could frustrate Vaughan, who struck him for some magnificent cover-driven boundaries. Lehmann also straight drove Caddick for a pair of boundaries before bringing up his own half-century with a pull off Michael Burns that ended the contest with more than 13 overs to spare. Somerset was on course for 250 with its Tasmanian captain Jamie Cox and Peter Bowler both making 62. Cox went to a careless dismissal, having struck five fours and two sixes. He attempted an eighth boundary from a Lehmann full toss only to pick out Michael Lumb at long-leg. His 72-ball knock dominated a second-wicket stand of 108 inside 24 overs. Caddick's England pace partner Darren Gough took one for 18 in 10 overs for Yorkshire. In the day's other two quarter-finals - Gloucestershire beat Durham on Tuesday - Surrey and Nottinghamshire enjoyed comprehensive victories over Sussex and Warwickshire respectively. At Hove, Surrey's Alistair Brown, renowned on the county circuit for his ability to make big scores in quick time, struck his second One-day century in four days, his unbeaten 108 off 147 balls taking his side to 239 for seven. Sussex was never in the hunt, bowled out for 186, Surrey winning by 53 runs. At Trent Bridge former Surrey opener Darren Bicknell's 117 not out guided Nottinghamshire (214 for four) to a six wicket win over Warwickshire for whom England left-hander Nick Knight made 103. Bicknell will now face brother Martin and all his old county colleagues in the semi-finals where Surrey entertains Nottinghamshire at The Oval on Monday June 25. On the same day Yorkshire welcomes trophy holders Gloucestershire to Headingley.