In a 17-year career, Welch compiled a 211–146 record with 1,969 strikeouts and a 3.47 ERA in 3,092 innings. His 137 wins during the 1980s was third among major league pitchers during that decade, following Jack Morris and Dave Stieb. He won the American League Cy Young Award in 1990 while playing for the Oakland Athletics. He threw two complete games in 1990, both of them shutouts. He finished in the top 10 voting for the National League Cy Young Award twice.
Los Angeles Dodgers
Welch gained national fame with Los Angeles in 1978, when as a 21-year-old rookie he struck out Reggie Jackson with two men on base and two out in the top of the ninth inning of Game 2 of the 1978 World Series against the New York Yankees. On May 29, 1980, Welch pitched a 3–0 one-hitter against the Atlanta Braves, facing the minimum 27 batters. The only Atlanta base runner was Larvell Blanks, who singled in the 4th inning and was retired on a double play. Welch won his first World Series in 1981 with the Los Angeles Dodgers after they defeated the New York Yankees in six games.
Oakland Athletics
Welch was the third starting pitcher in the rotation for the 1989 World Series champion Oakland A's, compiling a regular-season record of 17-8 and recording a win in his only start in the American League Championship Series against the Toronto Blue Jays. In an odd twist of fate, however, Welch did not throw a single pitch against the San Francisco Giants during the World Series itself. Just minutes before Welch was to take the mound in Game 3, Candlestick Park and the Bay Area were struck by the Loma Prieta earthquake, which caused extensive damage in the region and forced the postponement of the game. When the Series was resumed 11 days later, A's manager Tony La Russa opted to re-use his Game 1 starter, Dave Stewart, for Game 3 in place of Welch, and his Game 2 starter, Mike Moore, for Game 4 in place of originally scheduled starter Storm Davis. The strategy worked, as the A's swept the Series in four games giving him his second World Series. A two-time All-Star, Welch won 14 or more games in eight years, with a career-high 27 in 1990. He received the Cy Young Award that season, and was considered in the MVP vote. His 27 wins were the most by any pitcher since Steve Carlton also won 27 in, and currently stands as the last time a pitcher has won 25 or more games in a season. The last pitcher to win more games in a season was Denny McLain, with 31 wins in. 19 of his wins were saved by Dennis Eckersley, which remains a record. Welch was the starting pitcher of Game 2 of the 1990 World Series against the Cincinnati Reds. Welch's personal catcher throughout much of his Oakland Athletics career was Ron Hassey, as opposed to Terry Steinbach, who caught the majority of the Oakland pitching staff.
In 1991, Welch and New York Times sports columnist George Vecsey co-wrote Five O'Clock Comes Early: A Cy Young Award-Winner Recounts His Greatest Victory, which chronicled Welch's battle with alcoholism that he said started at the age of sixteen: "I would get a buzz on and I would stop being afraid of girls. I was shy, but with a couple of beers in me, it was all right." The book "...marked one of the first times an active professional athlete openly discussed a drinking addiction." An updated version was published after Welch's retirement, and the book was rereleased digitally on November 10, 2015.
Welch died of a broken neck resulting from an accidental fall in the bathroom of his Seal Beach, California home on June 9, 2014 at the age of 57. The Orange County Coroner's Office ruled that Welch suffered a cervical spine fracture "with epidural hemorrhage due to hyperextension of neck" suffered in the fall, negating earlier reports that he had died from a heart attack.