I'd love to see a defined foot placement diagram for each term used such as open stance, squared stance closed stance, or crossover. To me, a squared stance is heels aligned perpendicular to the net with the front foot pointed forward at an approximate 45-degree angle. As a kid, this was also often described to me as closed.
Open seems obvious enough. Your rear foot is parallel to the baseline on your last step off of either side when hitting either forehand or two handed backhand. An open stance on a one handed backhand is not usually effective and I don't suggest it. It would be an emergency shot and it limits reach.
Teaching volleys we used the term cross step or crossover. This stance is usually only good for one handed backhands or forehands on the run. Shouldn't that apply to a groundstrokes in the same fashion?
