Photos: Sadam Ali vs. Johan Perez - Official Weights

A rapid rise up the welterweight division will be at stake as two top contenders -- former Olympian Sadam "World Kid" Ali (24-1, 14 KOs) and former Interim WBA World Super Lightweight Champion Johan "El Terrible" Perez (22-3-4, 15 KOs) - will slug it out over 10 rounds for the vacant NABA Welterweight title in the main event of Golden Boy Boxing on ESPN on July 29 from Casino Del Sol in Tucson, Arizona.

Ali, a 28-year-old representative of the 2008 U.S. Olympic team who holds impressive wins over Francisco "Chia" Santana and Luis Carlos "El Potro" Abregu, is coming off back-to-back victories after falling short in his first attempt at a world title last year.

Ali weighed in at 147-pounds and Perez was 146.6. Eddie Gomez, who appears in the co-feature, was 146.6-pounds, and his opponent Alejandro Barrera was 147.

"A win in this fight puts me right back in position to compete for a world championship," Ali, who fights out of Brooklyn, New York, said. "I can't wait to get back in the ring and demonstrate the speed and power that has led me to be a top contender in the welterweight division."

Perez, a 33-year-old from Caracas, Venezuela who has held the interim WBA World Super Lightweight Championship and regional titles in the welterweight division, has defeated a number of top fighters including contender Yoshihiro "El Maestrito" Kamegai and former world champions Steve "2POUND" Forbes and dealt Paul "The Pittsburgh Kid" Spadafora the first and only defeat of his career.

"The time has come for me to re-establish my name in the welterweight division, and that's exactly what I'm planning to do on July 29," Perez said. "Whether it's by knockout or decision, when the fights comes to an end, I know I will have my hand raised in victory."

"When we launched Golden Boy Boxing on ESPN, I promised that we would showcase competitive fights every time out," Golden Boy Promotions CEO and Chairman Oscar De La Hoya said. "We have delivered on each and every card, and the July 29 main event between two hungry contenders in Ali and Perez will give fans exactly what they have come to expect from this series."