As a subject matter expert in sports history, particularly in the realm of baseball, I can provide you with an accurate answer to your question regarding the player who has appeared in the most World Series.
LeBron James is a professional basketball player and not a baseball player, so he is not the person we are looking for in the context of the World Series in baseball. The World Series is the championship series in Major League Baseball (MLB), and the player with the most appearances in this series is Yogi Berra. Yogi Berra, a Hall of Fame catcher, played for the New York Yankees and appeared in the World Series
15 times during his career, from 1947 to 1963.
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