Ken Buchanan won the world lightweight title in 1970, the first British boxer to do so since Freddie Welsh in 1917. Buchanan turned professional in 1965 and five years later, on 26 September 1970, on a night of 125-degree temperatures in Puerto Rico, he defeated Ismael Laguna to become the world lightweight boxing champion. In 1971, Buchanan twice successfully defended his title in Los Angeles and New York, versus Ruben Navarro and Laguna. He was eventually defeated by Roberto Duran on 26 June 1972. Buchanan retired from boxing in 1983: he had won 62 of his 70 fights. Buchanan was also the European Champion in 1974-75, British lightweight champion from 1968-71 and 1973-74.