Best ways to submit UFC Undisputed 2010

Hi, my submission skill is high, and the guy is always low staminia and injured but i can never pull it off.
any ideas? suggestions??|||Playing against CPU, it's almost always more worthwhile to just mount your opponent and KO him than try to submit him.|||

Playing against CPU, it's almost always more worthwhile to just mount your opponent and KO him than try to submit him.

i suppose, but it gets boring lol. thats why .|||Try to make sure you're doing a level 3 sub (your stamina won't drop as fast). Charging works a lot easier if you've got a lot more stamina than they do.