I heard someone the other day mention Jason Heyward and LeBron James in the same breath and imho the comparison is unfair to both players. Earlier this year, Sports Illustrated did it with Bryce Harper and that was even more unfair imho.
Lebron started in the NBA at 18 years old and averaged almost 21 points per game and almost 6 assists and 6 rebounds per game.
There aren't many in sports who basically start out productive at the top level and right from high school. Sydney Crosby and Wayne Gretzgy come to mind in hockey. Mickey Mantle was close but he also spent 1 year in the minor leagues. Jr. Griffey and A-Rod were very close as is Heyward, Justin Upton, and perhaps someone like Rick Porcello or Clayton Kershaw with the Dodgers. The only high schooler that I can think of that started immediately and productive in the big leagues was Bob Feller.
Am I missing anyone else from baseball? Joe Nuxall? Was he productive? Robin Yount was very young but it took him a year or two to settle in as I recall.
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