Three Washington, D.C., professional boxers, including undefeated cruiserweight Boone Pultz and welterweight Maurice Blocker, will fight in 10-round, nontitle bouts beginning at 8 tonight at the Washington Convention Center.

Welterweight Simon Brown, 22, whose only loss in 22 fights was a 12-round split decision to Marlon Starling in November, will attempt to regain the form that produced 15 knockouts in his first 21 professional fights. His opponent, Kevin Howard, 25, of Philadelphia, is 21-7-1 with 12 knockouts.

Howard was Sugar Ray Leonard's last opponent; he was stopped by Leonard in the ninth round in May 1984.

Pultz will be fighting for the first time since a bout with Stanley Ross in December for the U.S. Boxing Association cruiserweight title. Ross won the 12-round split decision but afterward tested positive for an illegal chemical substance and the championship was given to Pultz.

Pultz, a 26-year-old who has eight knockouts in 12 fights, will fight Albino Manson of Indianapolis tonight. Manson's record is 13-4 with 10 knockouts.

North American Boxing Federation welterweight champion Blocker, 22, who has 11 knockouts in 21 bouts, meets International Boxing Federation champion Leland Hart, who lost a 10-round decision March 1 to Tommy Ayers. In Blocker's last fight in December, he knocked out Efren Olivo in the first round.