#1 Ronda Rousey vs Cat Zingano
Back in 2015, Cat Zingano was regarded by many as the one who'd probably dethrone then-UFC Bantamweight Champion Ronda Rousey. Zingano was coming off a pair of huge TKO wins against Miesha Tate and Amanda Nunes. However, she was also dealing with a few issues in her life outside the Octagon at the time.
The lead-up to their UFC 184 fight featured a ton of respect on part of both competitors for one another. At the time, experts believed that Zingano may perhaps be at a disadvantage due to her battle with serious knee injury issues as well as her coach/husband's suicide.
Get the latest updates on One Championship Rankings at Sportskeeda and more
Nevertheless, 'Alpha Cat's' Muay Thai and wrestling were so very deadly, that a select few members of the MMA world truly believed that she could end up stopping Rousey.
The fight got underway, and Zingano opened up with a flying knee. In response to which, Rousey trapped her foe in a straight armbar -- securing the submission finish in about 14 seconds of the very first round.
Which first-round UFC finishes were you impressed with the most? Sound off in the comments!