Any surprise?
Bob Gibson hold this distinction, with five such seasons: 1965, 1966, 1968, 1969, and 1970. He also won 19 games twice and 18 games once.
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Fernando Valenzuela
Justin Verlander
For starters, that is Randy Johnson of the 1995 Mariners with a win percentage of .900 (record was 18-2).
Bob Welch of the Oakland Athletics was the last pitcher to win 25 or more games in a season. In 1990, Bob Welch won the American League Cy Young Award with a 27-6 record.
Wilbur Wood of the Chicago White Sox was 24-20 during the 1973 season, making him the last pitcher in American League history to win and lose 20 or more games in the same season.