In Chang's first world title try, he lost to Hilario Zapata of Panama by a 15 round split decision in 1982, by scores of 148-145, 142-144 and 144-147.
In 1986, he moved up to challenge WBA Flyweight Title holder Hilario Zapata but lost.
Zapata went to Japan in March 1980, and on the 24th day of that month he beat defending world champion Shigeo Nakajima to become world Jr.
Emiliano Zapata | Zapata | Viva Zapata! | Rodolfo Zapata | Pedro León Zapata | Metro Zapata | Hilario Zapata | Emiliano Zapata, Morelos | Dominic Zapata | Bodega Catena Zapata | Zapata, Texas | Zapata Swamp | Zapata Rail | Zapata: El sueño de un héroe | Hilario Davide, Jr. | Hilario Ascasubi | Carmen Zapata |