In baseball, "on-deck hitter" refers to the player who is batting next (after the batter who is at-bat).In a professional baseball game, the on-deck batter traditionally waits inside the 3-ft diameter "on-deck circle" which can be a simple outline or a piece of turf.There are two on-deck circles in all MLB stadiums.Some on-deck circles are awfully close to … [Read more...] about On-Deck Batter vs In-The-Hole Batter