Lamont Peterson and Thomas Williams, Jr. weighed in for their 12-round bouts at the Cintas Center in Cincinnati, Ohio.
Peterson tipped the scales at 146 1/2 pounds for his challenge for the interim WBA Welterweight championship. David Avanesyan, the defending champion, came in at the welterweight limit of 147 pounds.
Williams and his opponent, Marcus Browne, both weighed in at 174 1/2 pounds.
The Showtime telecast gets underway at 9 PM ET.