Joseph Diaz Jr. of South El Monte stopped overmatched Noel Mendoza of Phoenix at 1:54 of the third round Saturday night at StubHub Center.

Diaz decked Mendoza (6-3) twice in the third round, referee Raul Caiz Jr. waving off the bout after the second knockdown.

Diaz, a 2012 U.S. Olympian, is now 7-0 with five knockouts. His bout was televised on Showtime Extreme.