守備防御点
To calculate Defensive Runs Saved, for each ball hit, points are either added or subtracted to the fielder's rating depending on whether or not they make the play. For example, if a ball hit to the center fielder is expected to be caught 30 percent of the time, and it is caught, the fielder gains 0.7 points. If the center fielder does not catch the ball, he loses 0.3 points.