On June 30, 1997 In Baltimore, Cal Ripken’s second grand slam of the season is the big blow in a six-run 3rd inning as the Orioles beat the hapless Phillies, 8 – 1. Mike Mussina wins his 100th game to help Baltimore end its four-game losing streak. For the Phils, it is their 15th loss in 16 games.
Source
Baseball Reference June 30