Rising lightweight knockout artist Romero “Ruthless” Duno (17-1, 14 KOs) of General Santos City, Philippines defeated Gilberto “Flaco” Gonzalez (27-5, 22 KOs) of Mexico City, Mexico via 10-round unanimous decision in the main event of the May 17 edition of Golden Boy Boxing on ESPN at Fantasy Springs Resort Casino in Indio, Calif. Duno landed the harder shots in