The name of the Major League Baseball team that plays in Miami, Florida is the Miami Marlins.
According to baseball-reference.com, none. Odd, huh?
The IndiansThe Cleveland Indians are a Major League baseball team that plays in the American League Central.
Yes. Major League Baseball is the name of an organization and is therefore a proper noun. Iterations such as "major leagues" don't need to be capitalized, because they are not proper.
There is currently no one by that name in Major League Baseball.
His name was Jakie Robinson
The Detroit Tigers