Mihalić was born in 1920 in the village of Ludina (part of Kutina), in what is today Sisak-Moslavina County, Croatia. His father Josip was a tailor, while his mother Veronika was a housewife. Mihalić was born the tenth of their twelve children. When he was three years old, the family moved to Zagreb.
Mihalić started working at age 16 as a printing house apprentice. With his first wages he bought a bicycle, joined the Olimp cycling club, and then spent the next four years racing for them. He was fairly successful, being able to score top ten finishes competing against the best Croatian cyclists of the era. However, his enthusiasm for the sport was dampened by a number of major crashes he suffered in training and racing which resulted in injuries and permanent scarring.
Entry into athletics
Mihalić's entry into athletics was almost coincidental. In 1940, one of the events of the Workers' Sports Games in Zagreb was a cross country race. Mihalić was nominated for the race by his football club Grafičar as he was their fastest player. Despite the fact that he entered the first foot race in his life without any training, he placed second out of approximately 200 participants, narrowly losing to an experienced athlete. This event was crucial in his decision to leave cycling and take up athletics. He joined the Concordia Zagreb athletics club and after only several months of training set his first national record in the 5000 meters, followed shortly by a national record in the 10,000 meters.
During World War II Mihalić represented the Independent State of Croatia. He won several international competitions, set five national records and was named Croatian Sportsman of the Year three times. Mihalić used his top athlete status to avoid being drafted and declined membership in the Ustasha party by saying he was "apolitical". His first athletics coach Milčo Dobrin, who as a Jew had to wear a Star of David was barred from attending competitions. Later Dobrin managed to escape to Venezuela through Switzerland.
Following WWII Mihalić ran for the newly formed Mladost athletics club from 1945 to 1947, of which he was a co-founder. In 1947 he was transferred to Belgrade by the new communist Yugoslav authorities to join the Partizan sports association. Mihalić got a well-paid job and good conditions for training with his new club, so he decided to settle permanently in Belgrade, where he soon married and became a father.
Apart from his later victory in Boston, Mihalić scored wins in international marathons in Athens and Moscow (both in 1957).
1956 Summer Olympics
Mihalić won the marathon silver medal at the 1956 Summer Olympics in Melbourne. This was, in his view, the greatest achievement of his sports career. No Yugoslav track and field athlete has managed to win an Olympic medal since.
Mihalić came to Melbourne in good running shape; by his account, he had been training more than ever.Alain Mimoun of France and Veikko Karvonen of Finland were considered the pre-race favorites. Some have also seen Mihalić as one of the favorites, as he enhanced his reputation earlier in the year by winning the Balkan Games marathon in Belgrade in a then-spectacular time of 2:16:25, which would have been the fastest marathon race ever if the course had not been found too short. Mihalić himself judged that, in a field of 46 Olympic marathon entrants, 15 were better than him, but nevertheless he felt that he had a fighting chance for winning a medal.
The Olympic marathon was held in the afternoon of a very hot day, and the course provided little or no shade, except for the start and finish. Mihalić kept with the leading group, gradually advancing in the standings, but had a serious setback while approaching the first water station at the 15th kilometer. In a scramble for refreshment he tripped, collided with the water table and fell to the ground, injuring himself. Despite bruising his arms and legs he managed to get up and continue the race but only reconnected with the head of the pack at the 20th kilometer. Shortly after that, Mimoun suddenly broke away from the leading group. Mihalić decided against chasing him until the 35th kilometer, when he realized none of the other runners were able to follow. By that time however Mimoun had an advantage of more than a minute, and Mihalić was unable to catch up with him. In the end, he was the second to cross the finish line in a time of 2:26:32, a minute and a half after Mimoun, and a minute in front of the bronze medalist Veikko Karvonen.
1958 Boston Marathon
Another highlight of Mihalić's career came in the 1958 Boston Marathon race, held on an unusually warm day. He scored a decisive victory over the field, besting the defending champion John J. Kelley who took second place by nearly five minutes, and leaving the third-placed Einno Pulkkinen more than 11 minutes behind. Mihalić's winning time of 2:25:54 was five minutes short of Kelley's course record established in the previous year, but was still impressive given the hot weather in which the race was held. The "heat-loving Yugoslav's" successes in hot conditions were attributed to his unusual habit of training in the middle of the day, between noon and 2 pm.
Mihalić's 1958 Boston Marathon win was the first – and, as of 2015, the only – by a male Eastern European athlete.
Later career and retirement
Mihalić participated in the marathon at the 1960 Summer Olympics in Rome, finishing 12th, in a time of 2:21:52.6. His third and final Cinque Mulini win in 1961, shortly before his 41st birthday, was also his last major international result. Mihalić retired from sport in 1966 by winning his last race, the Kadinjača mini-marathon in Užice.
In his active career, Mihalić won 14 national championships (12 over 10,000 m and 2 over 5000 m), but never won a national marathon championship.
Mihalić participated in 10 km runs until his late 70s. He had to quit running on doctor's orders in the early 2000s when he severely injured his knee in the Cer-Šabac race. He then promptly switched to racewalking and won three gold medals in the 5 km event for Serbia and Montenegro at the veteran Balkan Games, the last one in 2005.
In late 2006, Mimoun, Mihalić and Karvonen, the three marathon medalists in the 1956 Olympics, met in Paris in a reunion organized by the French sports daily L'Équipe on the 50th anniversary of the Olympic marathon in Melbourne.
In his late 80s Mihalić still walked 3 kilometers every day from his Belgrade home to the Partizan Stadium, where he volunteered as an athletics coach. He participated in the 2009 Summer Universiade in Belgrade as an athletic referee. He died on 14 February 2015 at the age of 94.
I regret a bit for having been born too early. When I won the world's oldest marathon, in Boston in 1958, all I got was a gold medal. Today the winner gets one hundred thousand dollars and an automobile! If I'd win it two times – that would be enough. Yes, I regret a bit for not being 25 today.