The Big Unit has six 300-plus strikeout seasons, his best an ungodly 372 at age 37, in only 249-2/3 IP. Nolan Ryan's best year, 383 at the age of 26, took him 326 innings. That number barely edged out Sandy Koufax's 382 (the only other pitcher in the modern era to eclipse Johnson in this category), and that took the dazzlingly untouchable lefty 335-2/3 innings, and at the age of 29, in the season before he retired. These are the only two players to throw more Ks in a season than Randy, and they did it early in their careers, not the tail end.
