To give you an idea of how the AI is feeling a Red, Yellow, or Green stroke is drawn when they play a stroke, and a matching circle id drawn briefly over their icon after they play a shot.
 
If it is Red it means the player is undecided - they are unsettled by a mixture of the bowler, where the ball has been bowled, or how their team is performing. Red means they have a much higher chance of a miss-hit.
Yellow means the player is feeling defensive. They are concerned about the wickets that have fallen, but feel they just about have it under control. They will generally hit along the ground to reduce risk. Try bowling their weakness, and experiment with where you bowl to move this down to Red...
Green means the player is feeling Aggressive. They either feel great because there are plenty of wickets in hand, or recognise that they have been forced to be aggressive. They will hit the ball hard, and in the air - giving you a chance to catch them, but they WILL score 4's and 6's if you don't stop them. Try bowling their weakness, adjusting the line, or moving fielders to where their Wagon Wheel says they are hitting the ball.