Goose Gossage becomes the second player in major league history to record 300 career saves when he faces one batter and gets the final out in the Cubs’ 7-4 victory over Philadelphia at Wrigley Field. The future Hall of Fame right-handed reliever joins Rollie Fingers, who reached the milestone in 1982.

On August 6, 1988 — Goose Gossage becomes the second player in major league history to record 300 career saves when he faces one batter and gets the final out in the Cubs’ 7-4 victory over Philadelphia at Wrigley Field. The future Hall of Fame right-handed reliever joins Rollie Fingers, who reached the milestone in 1982.

Source:
Baseball Reference August 6
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game