Ronda Rousey headlines Saturday's card against fellow trailblazer Gina Carano with Francis Ngannou and Junior dos Santos in separate main card bouts.

Ronda Rousey rolled back the years as she submitted Gina Carano with a trademark armbar inside 15 seconds of their much-anticipated comeback fight.

In her 17-second submission of Gina Carano — by armbar, of course — Rousey didn’t just notch her first win since 2015, she helped open up debate about whether mixed martial arts would see its first se...