BURBANK Jose Aldo was born deep in Brazil's Amazon rainforest, while Frankie Edgar is from the Jersey Shore. Both learned how to fight on the streets long before they stepped in a cage, and both UFC stars quickly picked up an important survival lesson.
"It's always better to fight somebody your own size," Aldo said with a grin.
As the first featherweight champion the UFC has recognized, Aldo occupies a unique niche in mixed martial arts history. Edgar is one fight from earning a rare distinction of his own when they meet in UFC 156 on Saturday night in Las Vegas.
After several years of being an undersized lightweight who improbably rose to the top of his division with relentless conditioning and pure will, Edgar is finally picking on guys closer to his own size.
With an upset win over Aldo, Edgar could add the 145-pound title to the 155-pound belt he once held, putting him alongside Randy Couture and B.J. Penn as the only fighters to win championships in two weight classes.
"I don't know if I'll be the biggest at 145 pounds, but I won't be as outsized as I was at 155," Edgar said. "I'm definitely looking forward to it. This is something I've been thinking about for a while, and it's great to start right at the top with Jose."
The main event matches two of the UFC's most prominent smaller fighters. Edgar (14-3-1) is an underdog yet again in his seventh consecutive UFC title fight, while the dominant Aldo (21-1) faces arguably his toughest test as a champion after fighting just once in 2012.
"He'll fight all five rounds the same way," Aldo said. "He doesn't give up. He's a champion of a higher division, and that's motivation for me. He has a great reputation. This was a fight I really wanted."
One day shy of six years since his UFC debut, Edgar will take on another daunting challenge after narrowly losing his last two fights to lightweight champion Benson Henderson.
Aldo is in the UFC's top handful of pound-for-pound fighters despite a 13-month absence from the cage caused by a series of injuries. His kicks are among the most vicious in MMA, and his overall agility in the cage can be stunning to opponents and fans alike.
But ever since Edgar broke an orbital bone in his face during his MMA debut in an unsanctioned bout in the Bronx, he has been willing to do just about anything to win a fight. He claims it's part of his upbringing not in his loving childhood home, but in simply growing up in New Jersey.
"That's kind of the culture of the East Coast," he said with a laugh. "To fight on the boardwalk is part of what we do."
Edgar hasn't had to do any ridiculous weight-cutting, given that he normally walks around under 160 pounds, and he doesn't anticipate any problems making the 145-pound limit with all of his power intact.
Edgar likely would be favored against any other featherweight fighter, but the good-natured former Rutgers wrestler couldn't turn down an immediate title shot.
"If I win, it's going to take care of everything else," Edgar said. "The championship, the legacy, everything will be there. When I started out, I just wanted to make sure I was a person that could stick around and be a part of this sport, so to accomplish everything that I have is everything I ever imagined."