ロバート・ゲレーロ
On February 8, 1998 Sánchez won the vacant WBA Super Bantamweight Championship by upsetting Puerto Rican, former World Boxing Organization world's champion Rafael del Valle over twelve rounds. He would lose his title to fellow Mexican Néstor Garza. All three of his losses have been to World Champions Marco Antonio Barrera, Robert Guerrero, and Néstor Garza.