Gervonta 'Tank' Davis returns from his 140lbs exploits to take on Isaac Cruz in a lightweight clash.
'Tank' last fought in June against Mario Barrios in June to become the WBA 'interim' champion but is now back in his old stomping ground.
Cruz meanwhile is a late replacement, with Rolly Romero dropping out of the planned contest due to legal problems.
Davis may be wary of a new opponent, but he remains the heavy favourite for tonight's fight.
Here's everything you need to know about Davis vs. Cruz tonight.
The main card is set to get underway at 8 p.m. ET / 1 a.m. GMT with the main event ringwalks scheduled for 11 p.m. ET / 4 a.m. GMT. These timings are subject to change due to the length of the undercard fights.
The fight will be broadcast on Showtime PPV in the US, and international rights have been picked up by streaming service Fite, which is where fans in the UK can order the show.
The fight takes place at the Staples Center in Los Angeles, California.