JOSE ALDO, UFC featherweight champion
Aldo has scored the most knockdowns in UFC/WEC featherweight history (seven). He's aldo has never been knocked down himself in his UFC/WEC career.
Aldo has successfully defended 61 of 66 takedown attempts (92.4 percent) in his UFC/WEC career, which is the best takedown defense percentage in UFC/WEC featherweight history. Among UFC/WEC fighters with at least five fights and 20 opponent attempts, Aldo's takedown defense percentage is third all time behind Renan Barao and Gleison Tibau.
Aldo has landed 106 of 124 leg kick attempts (85.5 percent) in his UFC/WEC career, which equals the sixth highest accuracy rate all time among fighters with more than 100 leg-kick attempts.
CHAN SUNG JUNG, top featherweight contender
Jung is the first South Korean fighter in UFC history to compete for a championship. With a win, "The Korean Zombie" can become the first Asian-born fighter in UFC history to win a world title. Previous Asian title challengers are 0-5-1.
Jung is one of only three featherweights in UFC/WEC history to win "Knockout of the Night," "Submission of the Night," and "Fight of the Night" honors. The others are former WEC champs Urijah Faber and Mike Brown.
LYOTO MACHIDA, light heavyweight contender
Machida returns to his home country to compete for the first time since April 2006. "The Dragon" has only fought two of his 22 professional fights in Brazil.
With nine minutes and 30 seconds of fighting, Machida will pass Stephan Bonnar and Forrest Griffin for the third most total fight time for a light heavyweight in UFC history.
Machida's 82.3 percent takedown defense average is the best in UFC light heavyweight history (with a minimum of five fights and 20 opponent attempts). His opponent, Phil Davis, has completed at least one takedown against seven of the eight opponents he has faced in his UFC career.
Machida's 11 knockdowns landed are the second most in light-heavyweight history behind Chuck Liddell (14) and tied for fourth in UFC history.
PHIL DAVIS, light heavyweight contender
Davis wills look to become just the second American, after Nik Lentz, to win two UFC fights in Brazil. "Mr. Wonderful" currently is the only fighter in UFC history to submit a Brazilian fighter in his home country.
Davis owns a significant strike defense percentage of 74.2 percent, the best in light-heavyweight history and fourth best all time. The 28-year-old has yet to be knocked down in his 13-fight career.
Cezar Ferreira competes for the first time since winning the inaugural season of "The Ultimate Fighter: Brazil" at UFC 147 in June 2012.
Thales Leites returns to the UFC after being released in August 2009. The 32-year-old has gone 6-1 since with wins over UFC veterans Matt Horwich, Jeremy Horn, Tor Troeng, Jesse Taylor and Dean Lister.
The 14 preliminary-card fighters have a combined UFC record of 9-16-1.
Of a combined 23 professional victories, Vinny Magalhaes and Anthony Perosh have won all 23 fights by knockout or submission. Neither man has ever won an MMA fight by decision.
Anthony Perosh, 41, is the second oldest fighter on the UFC roster behind Dan Henderson.
Ian McCall is one of two fighters in the Top 10 of the latest USA TODAY Sports/MMAjunkie.com MMA rankings with at least two UFC fights and no victories in the organization. Lightweight Pat Healy is the other. McCall is ranked No. 4 at flyweight while Healy is the current No. 9 lightweight.
Rani Yahya is just one of two fighters in UFC history to earn a north-south-choke submission. The other is Jeff Monson. Yahya has two such submissions in his UFC/WEC career.
Yahya has earned 15 of his 18 professional wins by submission, with 12 in the first round. Yahya will compete in his home country Brazil for the first time since October 2004 – a span of nearly nine years.
Josh Clopton returns to competition after a 609-day layoff. The 32-year-old has not registered an official MMA win since Nov. 28, 2009.