Reversing its original decision, MLB’s official statistician, the Elias Sports Bureau, will now list Randy Johnson’s 20 strikeouts as tying a record. Although the game went into extra innings, Johnson’s nine-inning performance will be noted along with the Roger Clemens and Kerry Wood’s 20 strikeouts outings in the 2002 record book.

On May 19, 2001 — Reversing its original decision, MLB’s official statistician, the Elias Sports Bureau, will now list Randy Johnson’s 20 strikeouts as tying a record. Although the game went into extra innings, Johnson’s nine-inning performance will be noted along with the Roger Clemens and Kerry Wood’s 20 strikeouts outings in the 2002 record book.

Source:
Baseball Reference May 19