I've run in to to this a lot on UT online, so I'll give my strategy against high pressure teams.
Play with a team with more pace, increase the attacking nature of the team (right on the d-pad) and use the Left bumper on the Xbox (not sure on PS3) liberally to make runs as you pass so the player moves in to space. The idea is if the opponent is playing high pressure/fouling, you want to pass before the defender reaches you, then pass back on to your player's run. Don't be afraid to pass back to the defenders in order to retain possession.
Once you're in front of his challenges (passing before he gets to you), he'll get frantic and sprint harder to try and tackle. Continue to pass away, and eventually you'll be looking at a wide open box because he'll be pulling his last defender towards you. Just beware the evil offsides flag and you'll get in on goal with the extra pass.
Hope that helps. There are far better players on this board that may weigh in.