Marciano turned to professional boxing in 1947, after failing to become a professional baseball player. On his climb to the heavyweight title, he became the second boxer ever to knock out Joe Louis. He won the title in 1952 and defended it 6 times before retiring. The only heavyweight champion with a perfect professional record, he was undefeated in 49 fights—43 won by knockout. A test of the force of his punch found that it carried enough energy to lift how much weight one foot off the ground? Discuss
Source: The Free Dictionary