Jim Allenby starred with bat and ball as Glamorgan stormed into the final of the Yorkshire Bank 40, overcoming holders Hampshire by 31 runs at the Ageas Bowl.
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Australian-born Allenby, 30, was Glamorgan's top scorer with an unbeaten 74 and then took two wickets for 18 runs from eight miserly overs as Hampshire were knocked out at the semi-final stage of a limited overs competition for the second time this season.
Glamorgan head for Lord's for only the third time in their history and the first for 13 years on the back of Allenby's efforts - and three important wickets at the death for Michael Hogan.
The Welshmen will meet either Nottinghamshire or Somerset, who contest the second semi-final on Monday.
Hampshire were strong favourites against a side who had not beaten them in a limited overs match of any length since 2005.
Glamorgan's progress through their innings was unremarkable until the last four overs when they took the poweraply and fifth-wicket pair Allenby and Ben Wright smashed 57 against Chris Wood and Sohail Tanvir.
Left-arm pace bowler Wood conceded 35 from his final two overs including 18 in four balls to the belligerent Wright, hoisting Glamorgan from a modest 177 for four to an altogether more formidable total of 234 for four.
Allenby faced 71 balls and hit nine fours, pacing his innings to perfection on a wicket which later offered plenty of spin for Andrew Salter and Dean Cosker but offered less help to Hampshire pair Liam Dawson and Danny Briggs.
Wright was even more punishing, his 47 not out occupying only 28 balls in an innings which included sixes off Wood and Briggs. Together Wright and Allenby put on 83 for the fifth wicket in fewer than nine overs, accelerating at just the right time.
Hampshire immediately missed the big-hitting of England squad opener Michael Carberry when they began their response and were soon behind the run rate after losing James Vince and Michael Roberts, Carberry's inexperienced replacement, by the 12th over.
There was still hope for Hampshire while Jimmy Adams was at the crease but a mix-up over a possible single led to the dangerous Neil McKenzie being run out at 73 and although Adams and Sean Ervine each scored half-centuries the required rate rose to above 10 an over.
Hogan, who has been such an inspirational signing this year, finished Hampshire off when he came back for his final spell, holding a return catch to dismiss Adams for 59, inducing Ervine to offer a catch to Graham Wagg at long-on and then getting Dawson to hit to Wright at midwicket.
With the match over as a contest, Dimitri Mascarenhas made his way to the crease for a farewell performance, too late to alter the result, and ended eight not out to end his 17 years with the county.
Hogan finished with figures of four for 51 but it was Allenby who had done most to steer celebrating Glamorgan to their unexpected victory.