Originally Posted by KronoRed
Yup, not even close.
Koufax had only four seasons with an ERA+ of 160 or better. Randy Johnson's done it seven times. Lefty Grove did it seven times. Greg Maddux has done it seven times. Pedro Martinez did it seven times in a row (with a career-best of 285 compared to 190 for Koufax -- Maddux 273, Grove 219, Johnson 196). Clemens has done it eight times with a career-best of 226 (in 1997). Walter Johnson also did it eight times with a career-best of 259.
I agree it's not even close with Koufax, it's just that he's the one who's not even close. Amazing pitcher, but his legend far exceeds his accomplishments.