It doesn't matter where the fielder is standing. What matters is where the ball is. Example: If a ball is hit just to the foul side of the 3rd base line, but the 3rd baseman touches the ball with both feet in fair territory, it is still a foul ball.
2 people have responded to this and I still don't understand the question...…… 3B is playing his position & fields a grounder hit to him - Why would anyone even begin to think it would be Foul???
I think it meant “standing in fair ground, reaches across foul line to field ball over foul territory”.
