san fransisco giants and the New York Mets
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No one. Players are not allowed to play for two different teams in the same game in professional baseball.
Joe Youngblood
Some major league cities are large enough to support two teams. The New York Yankees are in the American League, while the New York Mets are in the National League. Before 1958, New York had three teams -- the Yankees, the New York Giants and the Brooklyn Dodgers.
Japanese teams
There are four pro baseball teams in Missouri