Video: UFC on FOX 23 open workouts featuring Julianna Pena, Donald Cerrone and more

It all goes down tomorrow night (Sat., Jan. 28, 2017) at UFC on FOX 23 live on FOX from inside the Pepsi Center in Denver, Colorado, as Ultimate Fighting Championship (UFC) women's bantamweight title threats Valentina Shevchenko and Julianna Pena lock horns in a crucial main event tilt. Not to be forgotten is a co-main event clash between popular mixed martial arts (MMA) star Donald Cerrone and a super durable Jorge Masvidal. Before that, heavyweights Andrei Arlovski and Francis Ngannou will collide in an important divisional bout.

As always, the main card participants took to the stage earlier this week for UFC on FOX 23 open workouts (shown above courtesy of UFC). With much at stake, especially in the main event matchup, all fighters looked poised to produce fireworks when the cage door shuts tight this weekend in the Mile-High City.

MMAmania.com will deliver LIVE round-by-round, blow-by-blow coverage of the entire UFC on FOX 23 fight card, starting with the UFC Fight Pass "Prelims" matches online, which are scheduled to begin at 4 p.m. ET, and then the remaining undercard balance on FOX Sports 1 at 5 p.m. ET, before the FOX main card start time at 8 p.m. ET.