MANCHESTER (AFP) - Amir Khan ensured there were no more losses for him at the end of a costly week by stopping Paul McCloskey on a cut in the sixth round on Saturday night. The World Boxing Association (WBA) champion made a fourth successful world title defence by technical unanimous decision after a cut above McCloskeys left eyebrow, caused by a clash of heads, prompted referee Luis Pabon to stop the fight in the sixth round in front of 18,000 supporters at the MEN Arena. Khan began the week losing an estimated one million pounds after a TV dispute ended in UK broadcaster Sky TV refusing to screen his fight, but the Englishman stayed on course for bigger pay-days. But it was an anti-climatic end to a fight that was just coming to the boil and McCloskeys corner were furious that the Northern Irishman was not allowed to continue. It was the 25th win of Khans career with just one defeat while McCloskey suffered the first blemish on his record, dropping to 22 wins and one defeat. The 2004 Olympic silver medallist declared winner by 60-54 scores on all three judges scorecards, after a clash of heads. The Northern Irish challenger entered the ring unbeaten European champion and it seemed like he was the home fighter with over 6,000 travelling fans roaring him on. McCloskey, 31, cleverly kept out of range for most of the opening round to avoid Khans customary quick start. Khan had sparred with Filipino Manny Pacquiao -- the worlds best pound-for-pound boxer -- and claimed it was perfect preparation to face another southpaw in McCloskey. And Khan began finding McCloskey more in the second as McCloskey failed to deal with the champions hand-speed. McCloskey had stopped five of his previous five opponents but Khan was a steep step up in class. Yet the challenger did not look out of depth in a see-saw third round, landing a left flush on the jaw from close range. Khan shook McCloskey with a right in the fourth and increased his attacking bursts in a lively fifth round. McCloskey survived a furious assault from Khan in the sixth before a clash of heads opened up a gruesome two-inch cut stretching from the forehead to left eyebrow. Referee Pabon called in the ringside doctor, who immediately called for the fight to be stopped, with the judges scorecards of 60-54 deciding the outcome by technical unanimous decision. The crowd booed as the scores of 60-54 from all three judges were read out and there were angry scenes in the ring. Amir Khan rejected Paul McCloskey's calls for a rematch after their world light-welterweight title fight was controversially stopped in the sixth round on Saturday. The English fighter retained his World Boxing Association (WBA) title by a technical unanimous points decision after the referee halted the fight due to a cut on McCloskey's forehead that stretched to his left eyebrow. Referee Luis Pabon stopped the fight on the advice of a ringside doctor and all three judges scored the bout 60-54 in the 24-year-old Englishman's favour. At the time of the stoppage, Khan was well in control of his fourth title defence with his fast flurries of punches. But many of the 18,000 crowd at the MEN Arena jeered the decision and McCloskey's corner were livid. The Northern Irishman's promoter Eddie Hearn has asked the British Boxing Board of Control (BBBofC) to launch an investigation into the stoppage decision. Khan, however, has no interest in a rematch and instead is set to fight American Tim Bradley, the World Boxing Council (WBC) and World Boxing Organisation (WBO) champion in a world title unification fight in the United States on July 23. "I've got bigger things to do than a rematch," Khan told a press conference on Saturday night. "I want to unify the decision and fight Bradley. He didn't win one round and with another two rounds I would have knocked him out. He was lucky the fight was stopped because otherwise he would have got knocked out. McCloskey, the European champion, was furious with the decision that ended his unbeaten record. The 31-year-old appeared at a heated press conference with seven stitches to the wound but insisted he should have been allowed to continue. "I didn't know why the doctor was in the ring in the first place, he wasn't even asked to come in, and I don't know why it was stopped," McCloskey said. "I thought it was bad but it could have carried on. It has been a lifetime of work, for that. "Paul definitely didn't quit the fight and I've spoken to Robert Smith at the British Boxing Board of Control and they will launch an investigation into the fight," Hearn told AFP. "I hope he then asks the WBA for an immediate rematch." But there have already been talks, before Khan stepped in the ring to face his British rival, with Bradley's team.