High Quality Content by WIKIPEDIA articles! Robert William Mackowiak (pronounced "ma-KO-vee-ACK") (born June 20, 1976) is an American professional baseball player who is currently a free agent. He bats left-handed, throws right-handed, and is a utility player. During his Major League Baseball career, he has played for the Pittsburgh Pirates, Chicago White Sox, San Diego Padres, and Washington Nationals. At the end of the 2008 season, Mackowiak's career batting average was .257.