In
1978, Guidry posted a career year, one of the best in the modern era. Against the
California Angels on
June 17, he
struck out a Yankee-record 18 batters. Guidry's 18-strikeout performance is usually cited as the launching pad of the
Yankee Stadium tradition of fans standing and clapping for a strikeout with two strikes on the opposing batter.
For the season, Guidry went 25-3, in a season that is among the top 10 in baseball history. He led the league with a sparkling 1.74
ERA, 25 wins, a .893 winning percentage, 9
shutouts, 248 strikeouts, and 6.15 hits allowed per 9 innings pitched. He held batters to a .193 batting average, .249 on base percentage, and .279 slugging percentage. He was even tougher with 2 outs and runners in scoring position (.152/.221/.253), and in the 9th inning of games (.119/.200/.136).
He claimed the
American League Cy Young Award. Guidry also finished second in
American League Most Valuable Player voting to
Boston Red Sox slugger
Jim Rice.
Guidry's 25th win of the regular season was his most significant, as he was the winning pitcher in the Yankees' 5-4 win over the Boston Red Sox in a one-game playoff at Fenway Park