Bob Olin decisioned Maxie Rosenboom in 15 rounds on November 16, 1934, to win the World Light-Heavyweight boxing crown. He lost his title 11 months later to John Henry Lewis in a 15-round decision.
Olin was undefeated in 35 amateur bouts, including the 1928 City of New York Golden Globes 175 lbs. Open championship.

A cagey boxer with a good punch, Olin had a quality but spotty record against the top pro fighters in the light-heavy division, registering 54 victories (25 by KO) in 85 career pro bouts, He drew 4 and had 27 losses.