 Ninety-three different pitchers have struck out three batters on nine consecutive pitches in a half-inning of a Major League Baseball (MLB) game , the most recent being Will Harris of the Houston Astros on September 27, 2019.Seven have accomplished the feat more than once in their career, and no player has ever struck out four batters on twelve pitches in an inning.John Clarkson was the first player to strike out three batters on nine pitches, doing so in the third inning for the Boston Beaneaters against the Philadelphia Quakers on June 4, 1889.