ORANGE, Calif. - Thompson Boxing Promotions and Gary Shaw Productions have signed undefeated welterweight Roberto Arriaza (10-0, 9 KOs) to an exclusive promotional contract, the two U.S. based promoters announced today.

Arriaza, a Nicaraguan national, fights tonight against Aristides Quintero (20-5-1, 17 KOs) of Panama for the vacant WBA Fedecentro welterweight title. The 9-round championship bout will be contested in San Salvador.

The 25-year-old Arriaza had this to say about the signing: "I feel very blessed to sign with Thompson Boxing and Gary Shaw Productions. They have a great history of developing talent and producing world champions. I'm hungry to be the best in the welterweight division. Nothing comes easy in this sport. I know I have a lot of hard work ahead of me."

"We like his size, skill, and power," said Alex Camponovo, matchmaker and general manager at Thompson Boxing Promotions. "He has strong technical ability and excellent instincts."

"Roberto is an exciting, young prospect," said Gary Shaw, president of Gary Shaw Productions. "We believe he has a lot of potential. He has all the tools to develop into an outstanding boxer."