Duffy was a product of the Swansea youth set-up, who broke into the side under Brian Flynn's management in August 2003. However, a few months later and after only a handful of impressive performances, Duffy was eventually snapped up by Harry Redknapp for a fee thought to be in the region of £100k - £250k.
Still only a teenager, Duffy spent a few months on loan at Championship outfit Burnley and will be looking to gain first-team experience after making just one appearance so far for Premiership Portsmouth. Still a fans' favourite at the Vetch, Duffy continues to return to the side that he supported as a boy to cheer on his old teammates on regular occasions.