Mark Anthony Grater (born January 19, 1964) is an American former professional baseball pitcher. Grater played in nine games over parts of two seasons for the St. Louis Cardinals and the Detroit Tigers of Major League Baseball (MLB). He batted and threw right-handed. Grater attended Monaca High School in Monaca, Pennsylvania and began his college baseball career at the Community College of Beaver County. As of 2011, Grater was in his eighteenth year as a pitching coach and was working for the Washington Nationals as their pitching rehabilitation coordinator. Prior to the 2021 season, he was named Washington's rehabilitation and Dominican Republic pitching coordinator. References External links , or Retrosheet Pura Pelota (Venezuelan Winter League) 1964 births Living people American expatriate baseball players in Canada Arkansas Travelers players Baseball players from Pennsylvania Calgary Cannons players Detroit Tigers players FIU Panthers baseball players Florida International University alumni Johnson City Cardinals players Junior college baseball players in the United States Louisville Redbirds players Major League Baseball pitchers Minor league baseball coaches People from Rochester, Pennsylvania Savannah Cardinals players Springfield Cardinals players St. Louis Cardinals players St. Petersburg Cardinals players Tiburones de La Guaira players American expatriate baseball players in Venezuela Tigres de Aragua players Toledo Mud Hens players