GENERAL KNOWLEDGE

Detailed explanation-1: -Marciano holds the record with heavyweight Brian Nielsen for the longest undefeated streak by a heavyweight. He is also the only world heavyweight champion to go undefeated throughout his professional career.

Detailed explanation-2: -Rocky Marciano is the only heavyweight professional boxer to have finished his career undefeated. He also holds the record for the highest knockout-to-win ratio in world heavyweight title fights at 85.71%.

Detailed explanation-3: -The following winter, The Super Fight aired in more than 600 theaters across America. Woroner had filmed seven different endings. In the first screening, a bloodied Marciano, trailing on points, knocked out Ali in the 13th round. Later, when the film was shown in Europe, Ali won.