Not to be out-done by Mike Stanton, fellow 20-year-old Jason Heyward is showing historic on-base skills

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I wrote earlier today about how historic Mike Stanton’s power is for a 20-year-old, but as David O’Brien of the Atlanta Journal Constitution points out it’s only fair to take a similar look at fellow 20-year-old Jason Heyward’s historic on-base skills.
Heyward went 1-for-4 with a homer and two walks yesterday, giving him a .398 on-base percentage in 124 games. Here’s a list of the top 10 on-base percentages in baseball history by a 20-year-old:

                    YEAR      OBP
Met Ott             1929     .449
Ted Williams        1939     .436
Al Kaline           1955     .421
Jimmie Foxx         1928     .416
Alex Rodriguez      1996     .414
JASON HEYWARD       2010     .398
Mickey Mantle       1952     .394
Ty Cobb             1907     .380
Frank Robinson      1956     .379
Arky Vaughan        1932     .375

That’s nine Hall of Famers and Heyward. Oh, and he’s also hitting .289 with 17 homers, 29 doubles, a .481 slugging percentage, and an .879 OPS that would be the eighth-highest ever for a 20-year-old.