UFC 138 is scheduled on November 5, 2011 at the LG Arena in Birmingham, England featuring Chris Leben vs Mark Muñoz in the main event.
Chris Leben had been tested positive of steroid after his unanimous decision lost to Michael Besping last October 8, 2008 at UFC 89. In his return on August 29, 2009 at UFC 102, Leben lost by submission via arm triangle choke at the hands of Jake Rosholt.
Chris Leben latest fight was at UFC 102,he won by knock out via punches over Wanderlei Silva last July 2, 2011. On the other hand, Mark Muñoz scored a unanimous decision over Demian Maia at UFC 131.
UFC 138 Chris Leben vs Mark Muñoz Main Card
Chris Leben vs Mark Muñoz
Brad Pickett vs Renan Barão
Thiago Alves vs Papy Abedi
Paul Taylor vs Anthony Njokuani
Preliminary Card
Terry Etim vs Edward Faaloloto
Cyrille Diabaté vsAnthony Perosh
Michihiro Omigawa vs Jason Young
Philip De Fries vs Oli Thompson
Chris Cope vs Che Mills
| Chris Leben | FIGHTER | Mark Muñoz |
| 31 | AGE | 33 |
| 5’11″ (180 cm) | HEIGHT | 6’0″ (183 cm) |
| Southpaw | STANCE | Orthodox |
| 12-7-0-0 | UFC RECORD | 8-2-0-0 |
| 185 lb. (84 kg) | WEIGHT | 185 lb. (84 kg) |
| 70.50″ (179.07 cm) | REACH | 71.00″ (180.34 cm) |
