Thomas Mitchell Herr (born April 4, 1956) is an American former professional baseball second baseman, who played in Major League Baseball (MLB) for the St. Louis Cardinals, Minnesota Twins, Philadelphia Phillies, San Francisco Giants, and New York Mets, from 1979 to 1991. Although he never won a Gold Glove Award, Herr retired with the highest all-time career fielding percentage for National League second basemen (.989), a figure that was matched and surpassed a few years later when Hall of Famer Ryne Sandberg retired. Herr started his minor league career with the Johnson City Cardinals in 1975. Two years later, he led the league with 156 hits, 80 runs, 50 stolen bases, and 515 at-bats while playing for St. Petersburg. Herr played in the 1982, 1985, and 1987 World Series – all with the Cardinals, finishing fifth in the MVP voting and making his only appearance in the All-Star Game in 1985. During the 1985 season, he set career highs in nearly every statistical category, including 110 RBIs which came along with only 8 home runs. A rare feat in the modern era of baseball, Herr remains the last NL player to drive in 100 or more runs in a season while hitting fewer than 10 home runs. Paul Molitor is the most recent AL and MLB player to drive in 100 or more runs in a season while hitting fewer than 10 home runs (9 home runs, 113 RBI in 1996). Early in the 1988 season he was traded to the Twins for Tom Brunansky. In a 13-season career, he batted .271 with 28 home runs and 574 RBIs in 1,514 games. He had 1,450 career hits in 5,349 at bats. An excellent second baseman, Herr recorded a career .989 fielding percentage. He is perhaps best remembered for hitting a walk-off grand slam in extra innings against the New York Mets on April 18, 1987. After Herr hit the grand slam many fans at Busch Stadium threw their stadium give-away seat cushions onto the field in celebration. The grand slam is also well known for Jack Buck's memorable call on KMOX radio.