Joseph Diaz Jr., a 2012 U.S. Olympian from South El Monte, is now 4-0 with two knockouts after stopping Eric Gotay in the third round of their super bantamweight bout Friday at the Cosmopolitan in Las Vegas.

Diaz, just 20, trains out of the Teamsters Youth Boxing Club in South El Monte. His bout with Gotay was scheduled for six rounds. Gotay, of the Dominican Republic, is 3-2.