Anything can happen in Ultimate Fighting Championship (UFC).
Last weekend, several upsets occurred in Porto Alegre, Brazil, site of UFC Fight Night: "Bigfoot vs. Mir." The aftermath of Fight Night 61 was felt by Bovada, costing the sportsbook nearly $1 million because of the 10 upsets.
Now bettors turn their attention to the UFC 184: "Rousey vs. Zingano" fight card, which takes place TONIGHT (Feb. 28, 2015) inside Staples Center in Los Angeles, California.
Also on tap in the co-main event is the debut of former multiple division champion boxer Holly Holm against No. 14-ranked bantamweight Raquel Pennington. Other notable tilts on the pay-per-view (PPV) include Jake Ellenberger vs. Josh Koscheck and Tony Ferguson vs. Gleison Tibau.
Read on and go inside some key numbers that surround UFC 184's five main card bouts:
1. Between Rousey and Zingano's 19 professional mixed martial arts fights, only one has gone to a decision
The judges might as well leave early because they won't be needed in this one.
"Rowdy" Ronda has only gotten better over time and has allowed just one foe (Miesha Tate) to take her out of the first round. Her striking is also coming along mightily and is no longer a significant weakness.
The former Olympic judoka is a force to reckoned with.
"Alpha" laid prey rather quickly in the Octagon with a nasty third-round technical (knockout) of former 135-pound title challenger Tate. Injuries slowed her roll, but the Colorado native returned even stronger, polishing off heavy-handed Brazilian Amanda Nunes at UFC 178.
Zingano's fight against Barb Honchak in Jan. 2010 was the only time a woman lasted 15 minutes in a cage with her.
2. Holly Holm's six knockout victories
Can "The Preacher's Daughter" handle the hype that surrounds her long-awaited Octagon debut?
It took a while, but Holm is here. The 33-year-old devastating boxer hopes that her regional mixed martial arts (MMA) successes follow her over to UFC.
Holm has racked up six technical (knockout) wins in her four-year career. Her opponent, Pennington, hasn't been finished via strikes in her career.
How Holm fares in her first foray into the Octagon will ultimately determine how quickly she's slotted against Rousey. If she fails to win impressively against the durable Pennington, then maybe she will be forced to prove herself once more.
Of course, this is all contingent upon Rousey successfully defending her title against Zingano, which will be no easy task.
"Kos" recently turned 37 years old in Nov. 2014. The former welterweight title challenger also hasn't fought in 18 months.
However, if "The Juggernaut" wants this one bad enough, it's his fight for the taking. Koscheck has seen better days.
In his eight UFC wins, Ellenberger has knocked out five opponents. He also defends the takedown at an 88 percent clip (per FightMetric).
"Kos" is not nearly the same fighter as he used to be and will find that his opponent can beat him to the punch repeatedly. His chances of obtaining a "W" tonight are not looking good.
4. Alan Jouban's seven career knockouts
The team Black House representative has deadly power in his hands. Seven of his 10 victories are of the knockout variety.
The 32-year-old Jouban ousted Seth Baczynski in the first round of their "Fight of the Night" winner at UFC Fight Night 47.
Jouban is also a southpaw and will surely be looking for the right hook every chance he gets. His opponent Richard Walsh, however, hasn't been finished via strikes in his near six-year-career.
Both men are coming into this meeting off of losses and it will be interesting to see which fighter comes out with more of a sense of urgency.
The Ultimate Fighter (TUF) 13 winner will face the toughest test of his UFC career when he takes on American Top Team's Tibau.
The California-based fighter possesses three UFC knockouts to his name and will look to utilize the healthy reach advantage he holds over Tibau.
Tibau is one of the most successful un-ranked lightweights. The 31-year-old Brazilian is also one of the biggest fighters in the division.
Tibau is the king of the grind -- 11 of his 15 Octagon wins have come by way of decision. Ferguson, who wrestled collegiately at Grand Valley State University, defends the takedown at a rate of 80 percent.
However, he's allowed four of them in his last two outings. If Ferguson wants to keep this fight from going to the ground, then he will want to use his reach to keep the Brazilian jiu-jitsu black belt Tibau at bay.
MMAmania.com will deliver LIVE round-by-round, blow-by-blow coverage of the entire UFC 184 fight card on Saturday night (Feb. 28, 2015) RIGHT HERE, starting with the Fight Pass "Prelims" matches online, which are scheduled to begin at 7 p.m. ET, and then the remaining under card balance on FOX Sports 1 at 8 p.m. ET before the PPV main card start time at 10 p.m. ET.