Every stadium has a few quirks built into it either intentionally or they may have evolved unintentionally through years of play. The umpires along with Major League Baseball must account for these quirks and establish rules so that the game may be called consistently. Within the confines of Chase Field you will find several playing field nuances that require specific ground rules. Below is a list of the known ground rules:
- Ball entering dugout or photographer’s area - OUT OF PLAY (Award by Book Rule).
- Ball on top step (lip) of dugout - IN PLAY.
- Ball striking guide wires that support backstop - OUT OF PLAY (no longer in flight if a batted ball).
- Batted ball in flight strikes fence of right-field corner wall and leaves the field - HOME RUN.
- Batted ball in flight strikes pole (painted black) above fence in right-center field - HOME RUN.
- Batted ball in flight strikes right of yellow line in right-center field - HOME RUN.
- Batted ball in flight strikes center field wall between yellow lines and caroms over shorter fence - HOME RUN.
- Batted ball in flight striking above yellow line in batter’s eye and rebounding onto playing field - HOME RUN.
- Batted ball striking yellow line - IN PLAY.
- Batted ball strikes roof over fair territory:
Ball shall be judged fair or foul in relation to where it strikes the ground or is touched by a fielder.
If caught by fielder, batter is out and runners advance at own risk.
- Batted ball strikes roof over foul territory - DEAD BALL.
Ball shall be judged foul, regardless of where it strikes the ground or is touched by fielder.
If caught by fielder - FOUL BALL, CANNOT BE CAUGHT.