Slumping at the plate in May 1970, Athletics owner Charlie O. Finley threatened to send Jackson to the minors. Jackson hit 23 home runs while batting .237 for the 1970 season. The Athletics sent him to play in Puerto Rico, where he played for the Santurce team and hit 20 homers and knocked in 47 runs to lead the league in both departments. Jackson hit a memorable home run in the 1971 All-Star Game at Tiger Stadium in Detroit. Batting for the American League against Pittsburgh Pirates pitcher Dock Ellis, the ball he hit soared above the right-field stands, striking the transformer of a light standard on the right field roof. While with the Angels in 1984, he hit a home run over that roof.