World champions Anthony Dirrell and Daniel Jacobs made weight in advance of their Friday night title defenses, as did their opponents, but not without incident.
As Dirrell approached Jack after the weigh-in for the obligatory face-off, he walked straight into his opponent, delivering a bump that pushed Jack backward.
Amid much trash-talking, the fighters and their handlers had to be separated, but nothing further ensued.
Truax, a Minnesota native, will be fighting at the UIC Pavilion for his third straight bout, having beaten Derek Ennis and Scott Simon, respectively, in July and November.
Both fights from Chicago’s UIC Pavilion will be broadcast on Spike TV, with coverage starting at 9 p.m. ET/PT.
Friday’s third televised bout will feature hard-hitting Mexican veteran Roberto Garcia against Baltimore native James Stevenson in a 151-pound catch-weight fight. Garcia weighed in at 150 pounds, while Stevenson came in at 146.5 Thursday.