Tirso del Rosario
Name: Tirso Del Rosario
Hometown: Manila, Metro Manila, Philippines
Pro Boxer: Record
From The Ring magazine, November 1947, page 51, in "From Philippine Rings," by Felipe J.C. Galang
"Tirso (del Rosario was formerly a student of the Far Eastern University when he began fighting in the amateur ranks. He won the amateur flyweight championship from 1939 to 1940. He turned professional in 1941. In his first pro fight he knocked out Little Jamito in Binang, Laguna. In his 14 pro fights, he was beaten once by Jackie Jurich, the former flyweight world champion, in the old Manila Square Garden. He drew once with Baby Garcia and won all other bouts."
Thus del Rosario seems to have had 14 professional bouts when he met Speed Cabanela in September 1947.