Arregui in game 11 has a soft serve compared to the others in that game they often get a running start in to the ball 5 feet or more in front of the back wall making it easier firing a powerfull rightside that will pass Arregui. If you look at other guy in that game like Arriaga or Egi they serve deeper with power trying to choke you in the corner with an ace or a return at best to mid court.
