Career stats for Sandy Koufax (SK) as of 10/15/57, age 21y 9mo, and Clayton Kershaw (CK) as of 6/26/09, age 21y 3mo.
SK: IP 205.2 W 09 L 10 H 182 ER 91 K 182 BB 108
CK: IP 190.1 W 10 L 10 H 171 ER 85 K 178 BB 94
SK: ERA=3.99, WHIP=1.41, K/9 innings=8.0
CK: ERA=4.01, WHIP=1.42, K/9 innings=8.7
If you don’t think that’s spooky, you’re not paying attention.
(yes, I know SK was pitching at Ebbets Field and doing a lot of relief pitching, and probably didn’t have great defense behind him; but still….and Kershaw is 6 mo younger. Physically they are virtual clones.)
See also this.
Over the line, Smokey! 
How many hundreds of third basemen came up hitting as well as or better than Matt Williams and Mike Schmidt? This is ridiculous.
T. J.
talk to Rick Honeycutt.
The two pitchers are in fact very similar in almost every way. Almost identical. If you don’t see that, you’re the silly one. Whether Kershaw will have a better or worse career than Koufax is another question. In the meantime, I think the Dodgers would do well to assume that Kershaw is susceptible to the same issues that limited Koufax’s career.
great site a very helpful informations.thamx
thanks and yer welcome.