 All of this enabled Katsidis to gradually build up a lead on two of the judges' scorecards, until a well-placed counter left hand from Casamayor caught him on the chin in the tenth round, flooring him for a fourth time.Barely able to stand up, Katsidis was able to carry on but shortly afterwards a further flurry of unanswered shots from Casamayor forced referee Jon Schorle to stop the fight.This handed Katsidis his first defeat and cost him the WBO interim lightweight title.