He was the oldest of six children. His father, Robert Sims, left the family when Hagler was young, and he was raised along with his siblings by his mother, Ida Mae Hagler. In , wanting to escape the race riots that plagued Newark at the time, Hagler's mother moved the family children to Brockton, Massachusetts, the hometown of hall of fame boxer Rocky Marciano. When he was 15 years old, Hagler began working out at a boxing gym in Brockton, where he met brothers Guareno "Goody" and Pat Petronelli, who trained and managed Hagler throughout his career. Hagler won 57 bouts as an amateur. On May 18, , he won his first professional fight, with a technical knockout TKO of Terry Ryan in the second round.
Marvelous Marvin Hagler
Marvin Hagler - BoxRec
Ray Charles Leonard born May 17, , best known as " Sugar " Ray Leonard , is an American former professional boxer , motivational speaker , and occasional actor. Often regarded as one of the greatest boxers of all time, he competed from to , winning world titles in five weight divisions ; the lineal championship in three weight divisions;  as well as the undisputed welterweight title. In , Leonard was voted by The Ring as the ninth greatest fighter of the last 80 years;  BoxRec ranks him as the 27th greatest boxer of all time, pound for pound. His father worked as a supermarket night manager and his mother was a nurse.
Marvin Hagler's Amateur Record
M arvelous Marvin Hagler was a hard-hitting lefty who could switch his stance and also box right-handed. The world middleweight champion from to , Hagler was a gutsy, aggressive fighter. Over the course of his 14 years as a professional boxer, he posted a record of and successfully defended his title 12 times before losing to Sugar Ray Leonard in an controversial split decision in He was the oldest of six children. His father, Robert Sims, left the family when Hagler was young, and he was raised along with his siblings by his mother, Ida Mae Hagler.
Marvin Hagler born Marvin Nathaniel Hagler ; May 23, also known as Marvelous Marvin Hagler  is an American former professional boxer who competed from to At six years and seven months, his reign as undisputed middleweight champion is the second longest of the last century, behind only Tony Zale , who reigned during World War II. In , annoyed that network announcers often did not refer to him by his nickname, "Marvelous", Hagler legally changed his name to Marvelous Marvin Hagler. In and , The Ring named him the fourth greatest middleweight of all time  and in named him the 17th greatest fighter of the past 80 years.