Jeffra captured the World Bantamweight title at the age of only twenty-three by outpointing Puerto Rican great Sixto Escobar on September 23, 1937 in a fifteen round points decision in New York's Polo Grounds [REF].
Jeffra, however, lost the title to Escobar in his home country in San Juan, Puerto, Rico, on February 20, 1938 in another classic fifteen round points decision before a crowd of around 13,000.