First half tries from Tommy Bowe after twenty minutes and Lee Byrne after thirty five minutes which were both converted put the Ospreys 3-14 up at half time, with the Leinster score coming from a Jonathan Sexton penalty after twenty three minutes.
Lee Byrne - Wales, Ospreys & British & Irish Lions RU (status - active)
He has also trialled for Ospreys but failed to make a big impression over former coach Lyn Jones.
The 2010 winner was Irish International, Tommy Bowe of Ospreys.