If the umpire is informed of a change, players can change the position they are playing at any time when time has been called. In theory, someone playing first base could be moved to be the pitcher.
This can happen if a manager has run out of usable pitchers and must use someone who vaguely remembers how to pitch.
And, if it is willed, that non-pitcher who gets to pitch can be a hero!
Middle Relief Pitcher. A pitcher who goes in around the 5th - 7th inning.
The win goes to the relief pitcher (assuming there was more than one relief pitcher) whom the official scorer feels was most instrumental in the victory. That relief pitcher must pitch at least 1 full inning, or pitch a crucial out if he pitches less than one inning.
It is an abberviation for relief pitcher
Will Smith is a relief pitcher for the Milwaukee Brewers.
Xavier Cedeno is a relief pitcher for the Washington Nationals.
Jeff Manship is a relief pitcher for the Philadelphia Phillies.
Charles Brewer is a relief pitcher for the Arizona Diamondbacks.
Matt West is a relief pitcher for the Texas Rangers.
Mark Lowe is a relief pitcher for the Cleveland Indians.
Marc Rzepczynski is a relief pitcher for the Cleveland Indians.
Pedro Figueroa is a relief pitcher for the Texas Rangers.
A.J. Ramos is a relief pitcher for the Miami Marlins.