It all ended in despair for Barker after getting his title bid off to a great start at the Boardwalk Hall, establishing his jab early on and bloodying the champions nose in the fourth round.
Both fighters looked to be in tremendous shape with pound-for-pound ranked Martinez tipping the scales at 158lbs, while undefeated European champion Barker came in at 159.5lbs.
Walsh vs Appleby
Commonwealth super-featherweight title
Friday 30 September, 8.30pm, BoxNation (Sky channel 456)
Speaking at the final press conference on Wednesday, Barker told the gathered media that he was ‘extremely confident’ despite going into the fight as the heavy underdog.
Darren Barker lets the iFilm London cameras into his gym in Loughton, Essex, and invites them to join him in the ring as he prepares for his fight against pound-for-pound ranked WBC middleweight diamond champion Sergio Martinez.
Barker, who is lined up to face Martinez on October 1 in Atlantic City, said he had nothing to fear after meeting the his opponent at a press conference last week in New York.
Barker's promoter Eddie Hearn revealed via his Twitter account that terms have been agreed for an October contest - although contracts for the bout had yet to be signed.