advanced player (computer) movement

hello all,
I have been making a game where you hit a ball and a fielder needs to retrieve it. Simple? I have spent ages trying to figure it out and need your help.
So this is what you guys have to work with. I know the angle of where the ball is moving and I know where the fielder is located. What I want to happen is that the fielder moves to the path of the ball. Is this possible?
I have figured out that the quickest way to get to the path of the ball is perpendicular to the path but need an angle so the fielder can actually move towards it.
thankyou all very much.