On June 7, a section in the right field mezzanine at Jacobs Field was officially opened as "Pronkville." On July 7, Hafner became the first player in Major League history to hit five grand slams before the All-Star break and passed Al Rosen in the team's season record book when he homered off Kris Benson of the Baltimore Orioles. He joined Hall-of-Famer Ernie Banks of the 1955 Chicago Cubs, Jim Gentile of the 1961 Orioles and Don Mattingly of the 1987 Yankees as the only players to hit at least five grand slams in a season.