The Yankees hit 10 grand slams, the most by an MLB team in 1987. Six of those were hit by Don Mattingly, who set a record for most grand slam home runs in one season with six. His record was matched by Travis Hafner during the 2006 season. Mattingly's Grand Slams in 1987 were also the only six Grand Slams of his career. In addition, Mattingly had tied Dale Long's major league record by hitting home runs in eight consecutive games (record later tied again by Ken Griffey, Jr., of Seattle in 1993), as well as stroking an extra base hit in ten consecutive games. Mattingly had a record 10 home runs during this streak (Long & Griffey had eight of them).