Brewers reliever Rollie Fingers (23 saves, 1.96 ERA) undergoes back surgery to alleviate a herniated disk and will miss the remainder of the season.

On August 3, 1984 — Brewers reliever Rollie Fingers (23 saves, 1.96 ERA) undergoes back surgery to alleviate a herniated disk and will miss the remainder of the season.

Source:
Baseball Reference August 3
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