Wladimir Klitschko of Ukraine has successfully defended his world heavyweight boxing title for the 18th time in a row.At Madison Square Garden in New York, Klitschko beat his American challenger Bryant Jennings with a unanimous points decision last night. Klitschko's next title defence is likely to be a mandatory WBA bout against Briton Tyson Fury. The Ukrainian said this in the early hours of Sunday after winning against Bryant Jennings. Klitschko said negotiations would begin soon on a fight against Fury.