At the time of this question, Mark Buehrle had the most strikeouts, but currently Freddy Garcia does.
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The MLB record for strikeouts in a doubleheader is 7 and is held by six players ... Pat Seerey of the Chicago White Sox in 1948, Dave Nicholson of the White Sox in 1963, Frank Howard of the Washington Senators in 1965, Bill Melton of the White Sox in 1970, Mike Vail of the New York Mets in 1975, and Shea Hillenbrand of the Toronto Blue Jays in 2005.
Roger Clemens
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Matt Kilroy of the Baltimore Orioles had 513 strikeouts in 1886. Nolan Ryan who had 383 strikeouts in 1973 for the California Angels holds the modern day record. The record for most strikeouts in a single game is 20, shared by Kerry Wood and Roger Clemens, who did it twice. -------------------------------------------------------------------------------------------------------------------------- Not really germaine to the question but the record for most strikeouts in a game is 21 held by Tom Cheney of the Washington Senators who did the deed in 1962 against the Baltimore Orioles in a 16 inning game. Wood, Clemens, and Randy Johnson hold the record for strikeouts in a 9 inning game with 20.
Kerry Wood and Roger Clemens hold the record for strikeouts in a game with 20. Clemens did this twice with the Red Sox (1986 and 1996) and Kerry Wood did this in his rookie year in 1998.