UFC 123: "Rampage vs. Machida" is set for Nov. 20, 2010, from the Palace of Auburn Hills in the suburbs of Detroit, Michigan.
Munoz and Simpson -- two of the Octagon's most gifted mat technicians -- will both be out to rebound from tough losses in their most recent performances.
Munoz is coming off a hard-fought split-decision loss to Yushin Okami at last month's UFC on Versus 2 event in San Diego, while "A-Train" was stopped via technical knockout by the resurgent Chris Leben at the Ultimate Fighter 11 Finale back in June.
Also hitting the airwaves is bright young prospect, Rory MacDonald, looking to bounce back from the first loss of his professional career against Matt Brown.
MacDonald was seconds away from likely defeating Carlos Condit at UFC 112 before "The Natural Born Killer" stormed back to score a late third round technical knockout. Brown, meanwhile, needs a win in a major way after losing back-to-back fights to Chris Lytle and Ricardo Almeida.
UFC 123 will be headlined by a light heavyweight match up of top contenders Lyoto "The Dragon" Machida and Quinton "Rampage" Jackson. And two guys you've probably never heard of, Matt Hughes and BJ "The Prodigy" Penn, will finally complete their welterweight trilogy.
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