Britain's James DeGale will look to defend his IBF super-middleweight title against Mexico's Rogelio Medina on Saturday in Washington DC.
It is the 30-year-old's second defence after he beat former champion Lucian Bute by a unanimous decision last year.
A win for the former Olympic champion would set up a potential unification bout with WBC title holder Badou Jack.
Sweden's Jack, who previously defeated Medina, will face Romanian-Canadian fighter Bute as the card's main event.
DeGale was originally due to fight Jose Uzcategui, but the Venezuelan pulled out because of illness in February.
That left Medina as the mandatory challenger and the 27-year-old heads into the fight with 36 wins from 42 fights.
DeGale has said he will give fellow Englishman Callum Smith, who stopped Hadillah Mohoumadi inside one round earlier this month, a shot at the title.
Unbeaten Smith is the mandatory challenger for the WBC belt, though Jack is likely to first face DeGale should both win this weekend.