Unbeaten Errol Spence Jr says he will dominate Lamont Peterson in his first IBF welterweight title defence in Brooklyn, New York on Saturday. Spence Jr (22-0-KO19) weighed in on Friday night exactly on the welterweight limit of 147 pounds while his opponent Peterson (35-3-1-KO17) came in just under at 146.75 pounds. Spence Jr defends his IBF welterweight title for the first time since dethroning Kell Brook at Bramall Lane in August 2017.