Revised Zone Rating is the proportion of balls hit into a fielder’s zone that he successfully converted into an out. Zone Rating was invented by John Dewan when he was CEO of Stats Inc. John is now the owner of Baseball Info Solutions, where he has revised the original Zone Rating calculation so that it now lists balls handled out of the zone (OOZ) separately (and doesn’t include them in the ZR calculation) and doesn’t give players extra credit for double plays (Stats had already made that change). We believe both changes improve Zone Ratings substantially. To get a full picture of a player’s range, you should evaluate both his Revised Zone Rating and his plays made out of zone (OOZ).

I guess UZR is being phased out?

coaches telling players to move left/right/in/out.

Shouldn’t that affect the “zone”.

Example: Jerry in his wisdom tells Bay to shade a batter towards left center. Bay, being Canadian and all, doesn’t argue and moves 20 feet to his left. This now shifts his zone.

The batter then hits a ball near the line, where Bay could have easily gotten to it, were it not for Jerry’s genious.

This brings more accuracy to fielding stats and it should be interesting to compare +/- and UZR.