The best replacement for koufax is gibson.

The best alternatives to koufax are rated as following:
★★★★★  gibson
★★★★★  marichal
★★★★  mantle
★★★★  mays
★★  bob gibson
★★  kershaw
★  juan marichal
★  spahn
★  nolan ryan
★  clemente
★  pedro martinez
★  hank aaron
★  mickey mantle
  aaron
  clayton kershaw
  randy johnson
  willie mays

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Speaking about koufax, one probably shouldn't forget about joe torre.

Other search terms related to koufax and their ratings are:
★★★★★ joe torre
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