a rescheduling of their cancelled fight from March 2010. Staged at the MGM Grand, it formed part of the pay-per-view undercard to Érik Morales vs. Marcos Maidana. The WBA and, once again, WBO interim titles were at stake. Despite an animated taunt of "What are you looking at?!" from Katsidis to Guerrero during their pre-fight staredown, a fourth career defeat would await Katsidis in his most one-sided to date. Guerrero was able to maintain a safe distance by consistently landing accurate punches with his jab and straight left hand, to which Katsidis had virtually no answer at any stage in the fight. In the second round, Katsidis seemingly scored a knockdown due to a cuffing left hook, but this was not counted by referee Russell Mora. In the fourth, both fighters exchanged punches wildly, with Guerrero maintaining the upper hand. A hard straight left from Guerrero wobbled Katsidis in round five and had him hurt for the remainder of the round. As the fight wore on, Katsidis would lose two points in the eighth round because of repeated low blows; Guerrero also lost a point for the same reason in the ninth. With all twelve rounds completed, the judges were unanimous in scoring 118–107, 118–106 and 117–108 for Guerrero. Katsidis then moved up to light-welterweight for a fight against Michael Lozada on 13 August at the Gold Coast Convention and Exhibition Centre in Queensland. It was his first fight in Australia since 2006, as well as his first at light-welterweight since that time. An outmatched Lozada was stopped in the third round. In a move back down to lightweight, Katsidis next fought Ricky Burns for the vacant WBO interim lightweight title. The event took place at the Wembley Arena in London on 5 November, making it Katsidis' third fight in England. Burns defeated Katsidis by way of unanimous decision with judges' scores of 117–112, 117–111 and 117–111. Later that month, it was announced that Katsidis and career-long trainer Brendon Smith had amicably parted ways after nearly twenty years. In an in-depth December interview, he explained that he was on the lookout for a new manager, promoter and trainer, as well as a forthcoming fight. 2012: trainer changes Having hired a new trainer in fellow Australian and former heavyweight contender Justin Fortune, Katsidis moved up light-welterweight again for a fight against Albert Mensah, which took place on 13 April 2012 at