In the first doubleheader ever played at the Skydome, the Blue Jays sweep a pair from California, 6 – 4 and 5 – 4. Both wins go to David Wells, pitching in relief, with Tom Henke notching two saves. Wells becomes the first pitcher in five years to win both games of a doubleheader. The next doubleheader in Toronto won’t come until October 2001.

This Day In Baseball

On July 17, 1989 In the first doubleheader ever played at the Skydome, the Blue Jays sweep a pair from California, 6 – 4 and 5 – 4. Both wins go to David Wells, pitching in relief, with Tom Henke notching two saves. Wells becomes the first pitcher in five years to win both games of a doubleheader. The next doubleheader in Toronto won’t come until October 2001.

Source
Baseball Reference July 17