If a team announces a pinch hitter after the pitcher has warmed up to start an inning, the defense may not make a pitching change.
For example, Spencer Strider is on the mound and starting the 7th with 103 pitches. He comes out, warms up, and then the Phillies announce that Bryce Harper will come off the bench to pinch hit. The Braves are not allowed to bring on a LHP to face Harper; gives the offense a real advantage in an effort to save time.
Sent from my iPhone using Operation Sports