When you are batting, the AI will take note of where you are scoring runs and adjust the field to suit. Try hitting in an area regularly, then adjust your attack when the AI makes its move :)
 
When batting, all AI Batters have 2 quarters of the field it feels comfortable hitting to, and two it isn't. Check the wagon wheel, and adjust your line, bowler type, and field to try and make them uncomfortable...
 
Can't get a wicket? Try moving your field in close to force the batsmen to play aggressive - they will start hitting the ball in the air. Look out for the fours and sixes though!!!