Is this 2D or 3D?
It makes a bit of a difference to the code.
In 2D you need to set the angle of the player based on the angle between the enemy player and the player with the ball. This can be calculated using "atanfull". Just take the sprite position of the player with the ball from the sprite position of the enemy and feed the difference in x and y into atanfull to get the angle between them.
In 3D you can use "point object" (using "object position x(obj)" (...also using y and z) to point at the player with the ball) and "move object" to move towards him.
Hope that helps!