The weights are in for Saturday's HBO televised doubleheader from the StubHub Center in Carson, California.

In the headline event, Lucas Matthysse (37-3, 34 KOs) of Trelew, Chubut, Argentina and Viktor Postol (27-0, 11 KOs) of Kiev, Ukraine, compete for a vacant 140-pound title belt in a 12-round super lightweight fight. Both fighters weighed in at 139.4-pounds.

Opening the evening is a ten-round super lightweight bout featuring Humberto Soto (65-8-2, 35 KOs) and Antonio Orozco (22-0, 15 KOs). Soto, 35, of Los Mochis, Sinaloa, Mexico, is a skilled veteran with three division world titles on his resume and more than three times the professional experience of his opponent. Orozco, a 27-year-old Mexican native who currently hails from San Diego, is seeking national recognition in a highly competitive division.

Soto came in at 140.2-pounds and Orozco was 140.6-pounds.

Matthysse, celebrating his 33rd birthday this week, fought the rugged and relentless Ruslan Provodnikov last April, scoring a thrilling triumph in a contest many ringside observers view as the leading candidate for fight of the year honors. The undefeated Postol is a skilled 31-year-old who is embracing the challenge of meeting one of the sport’s most devastating punchers at a venue known for eye-opening outcomes.