Mariano Rivera, usually used in relief, is allowed to start a game of a doubleheader on the final day of the season for the Gulf Coast Yankees, giving him the opportunity to throw enough innings to qualify for GCL’s ERA title, an accomplishment that carries a contractual bonus. The Sandman responds by hurling a seven-inning no-hitter against Bradenton to finish the season with a 0.17 ERA, 0.46 WHIP, 58 strikeouts in 52 innings, and $500 richer.

On August 31, 1990 — Mariano Rivera, usually used in relief, is allowed to start a game of a doubleheader on the final day of the season for the Gulf Coast Yankees, giving him the opportunity to throw enough innings to qualify for GCL’s ERA title, an accomplishment that carries a contractual bonus. The Sandman responds by hurling a seven-inning no-hitter against Bradenton to finish the season with a 0.17 ERA, 0.46 WHIP, 58 strikeouts in 52 innings, and $500 richer.

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Sources:
Baseball Reference August 31
National Pastime August 31
Retro Sheet
Hall of Fame
SABR Games Project
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