Griffey starts his own club — 400
The Mariners have their first 400-HR club member, the same guy who started the 300-HR club.
With one mighty swing of his bat in the fifth inning tonight, Ken Griffey Jr. sent a Jered Weaver pitch into the right field seats.
The 400th home run of his career wearing a Mariners uniform was the 613th of his Major League career. The latest came on a 1-and-0 pitch from Weaver. Two pitches earlier, left fielder Endy Chavez hit his first career home run with the Mariners.
The crowd gave Griffey a thunderous ovation and he came out for a curtain call.
— Jim Street
Street's Corner 
I guess we can all stop grieving over Griffey’s lost home run on 9/6/96 in Cleveland that got erased due to a rain out and made him finish the season 49 HRs instead of 50. Had that home run counted, Griff’s 400th as a Mariner would have been his opening day HR in Minnesota and, while it still would have been mighty exciting, his home run in front of the home town fans wouldn’t have been as historic last night.