At Yankee Stadium’s home opener, with the fans chanting his name, Hideki Matsui hits his first major league home run, a grand slam, against the Minnesota Twins.
On April 8, 2003 – At Yankee Stadium’s home opener, with the fans chanting his name, Hideki Matsui hits his first major league home run, a grand slam, against the Minnesota Twins.
Source
Baseball Reference April 8