Rocky Marciano

American heavyweight boxer who retired as the only undefeated heavyweight champion in boxing history with a perfect 49-0 professional record.

Rocco Francis Marchegiano — Rocky Marciano — was born in Brockton, Massachusetts in 1923 and retired in 1956 as the only heavyweight champion in history with a perfect professional record — 49 wins, 43 by knockout (88% KO rate) and 0 losses or draws. His career spanned 1947 to 1955. He won the world heavyweight title by stopping Joe Louis — the iconic champion — in 1951, and claimed the undisputed heavyweight championship by stopping Jersey Joe Walcott in 13 rounds in September 1952, coming from behind after being knocked down. He defended the title 6 times. His power was exceptional — described by trainer Charley Goldman as the hardest puncher pound-for-pound in heavyweight history — and his conditioning was legendary, often training in spartan conditions with minimal equipment. He was not tall for a heavyweight at 5ft 10in and his reach was short, but his relentless forward pressure, granite chin and punching power overcame every opponent. He retired voluntarily in 1956 at 31, citing a desire to spend time with his family. He was Ring Magazine Fighter of the Year in 1952 and 1954. He died in a plane crash in August 1969, aged 45, one day before his 46th birthday.

Aggressive swarming style with exceptional punching power and granite chin

Considered one of greatest heavyweight champions, known for devastating punching power and relentless fighting style

• Undisputed Heavyweight Champion 1952–1956
• Only heavyweight champion to retire undefeated
• Ring Magazine Fighter of Year 1952, 1954
• Perfect professional record 49-0
• Ring Magazine greatest heavyweight of all time (ranked)