Rocky Marciano retired with a undefeated 49-0 record. The only heavyweight to accomplish such a feat.
Rocky marciano
Mike Tyson hold the record for the youngest heavyweight champion of the world at 20 years, 4 months and 22 days old
Joe Lewis held the heavyweight boxing championship record from June 22, 1937 to March 1, 1949. He still holds the record for holding the title longer than any man at 11 years, 8 months and 8 days.
Triple H has been world heavyweight champion a record 8 times
He Was! Retired unbeaten with a 49-0 record, 43 wins by Ko. The man died in a plane wreckage years later.
Rocky Marciano holds the record for the longest undefeated streak by a heavyweight and for being the only world heavyweight champion to go undefeated throughout his career. This record was challenged by Larry Holmes in 1985 when Holmes went 48-0 before losing to Michael Spinks twice. Light heavyweight Dariusz Michalczewski also challenged Marciano's record when he was 48-0, but lost to Julio César González in his 49th fight. Julio César Chávez holds the record for longest win streak with eighty-eight straight until he suffered a draw in 1993. Heavyweight Brian Nielsen tied Marciano's record but lost his 50th fight against Dicky Ryan. Willie Pep, a featherweight, had a perfect 62-0 record before he was defeated once, followed by a 72-0-1 undefeated streak. Packy McFarland was a lightweight (fighting between 1904-1915) who lost his first fight and then won his next 98, though he never won the lightweight title. Heavyweight champion Gene Tunney never suffered a defeat at heavyweight and retired as champion, although he did lose one fight at light heavyweight.
Edge is a record 7 time World Heavyweight Champion.
Aaron Pryor finished his boxing career with a 39-1 record.
Triple H is a thirteen-time World Champion: an eight-time WWE Champion, and a five-time World Heavyweight Champion. And he has many more years left in his career. So probably he will beat Flairs record of 16 world titles.
Marciano is the only heavyweight champion to retire with an undefeated record, though he is often omitted from the lists of the greatest of all time due to the realitivly low level of competition in the heavyweight division at that time...
His gas tank was pretty much empty. His last two fights were embarrassing losses to heavyweight champion Larry Holmes and Trevor Berbick. He retired for good in 1981 with 56-5 record.
The record holder is Jimmy Thunder who knocked out Crawford Grimsley in 13 seconds in round 1