Conversation so far:
What happened in 1960-1964 involving Abebe Bikila?
Abebe Bikila returned to his homeland of Ethiopia a hero.
Why did Abebe Bikila return to his homeland of Ethiopia as a hero?
Abebe Bikila won his first gold medal at the 1960 Summer Olympics in Rome while running barefoot
What happened after Abebe Bikila returned home to Ethiopia as a hero?
Abebe Bikila was paraded through the streets of Addis Ababa along a procession route lined with thousands of people and presented to Emperor Haile Selassie.
Did Emperor Haile Selassie present Adebe Bikila an award?
Emperor Haile Selassie awarded Abebe Bikila the Star of Ethiopia, a promotion to the rank of asiraleqa (corporal), the use of a chauffeur-driven Volkswagen Beetle, and a home
Are there any other interesting aspects about Adebe Bikila between 1960 and 1964 besides returning home to Ethiopia as a hero, being a hero for his 1960 Olympic Marathon performance, being paraded through the streets of Addis Ababa, and Emperor Haile Selassie awarding Bikila greatly?
In the 1961 Athens Classical Marathon, Abebe Bikila again won while running barefoot. This was the second and last event in which he competed barefooted.
Did Adebe Bikila participate in other competitions after the 1961 Athens Classical Marathon?
Abebe Bikila ran the 1963 Boston Marathon and finished fifth in 2:24:43. This was the only time in his competitive career that he completed an international marathon without winning.

Question: Who did he win against?
Self-contained rewrite: Who did Adebe Bikila win against in the Boston Marathon?