Sponsored Content SportsEngine, a brand from NBC Sports Next is the leading provider of Sport Relationship Management (SRM) software, empowering athletes, parents, coaches, and sports organization administrators with tools and services to manage their organizations and sports lives. Read SportsEngine stories Major League Record Sixth Grand Slam of the Season June 2, 2021 | 0 minutes, 28 seconds read On this day, in 1987 Don Mattingly set a Major League record with his sixth grand slam of the season to lead the New York Yankees to a 6-0 victory over the Boston Red Sox. September 29, 1987 Sport: Baseball Trivia sports in this article Baseball tags in this article Fan On This Day SportsEngine