First pitcher to strike out 20 batters in a game?

Answer 1

There have been three pitchers to strikeout 20 batters in one game and one pitcher to strikeout 21 batters in a game. The three to strikeout 20 were Kerry Wood, Roger Clemens, and Randy Johnson. All three struckout all those batters in a nine inning game. The pitcher to strikeout 21 batters, Tom Cheney, needed 16 innings. Cheney's 21 strikeouts is the MLB record for strikeouts by a pitcher in a single game.

Answer 2

Nolan Ryan struck out the most batters, but Reggie Jackson struck out the most at the plate.

Answer 3

In MLB, that was Tom Cheney of the 1962 Washington Senators.

Cheney struckout 21 Baltimore Orioles in a 16 inning, complete game performance on September 12, 1962 winning 2-1.