My favorite martial arts actor...
Reasons---
1. Real pro, no wire-fu shit, highly talented and skilled.
2. Good looking, can speak in different accents, can act well. Most other martial arts actors like Tony Jaa, Jet Lee suck on these aspects.
3. Very good command over his body - He increased his body weight upto 200+lbs in months for Undisputed 2, then reduced it to "Ninja" level in 2-3 months and again attained the 200+lbs level for Undisputed 3.