The Miami Marlins are a part of a pro sports organization.
Miami Marlins . The Marlins have the distinction of winning a World Series championship in both seasons they qualified for the postseason , doing so in 1997 and 2003 -- both times as the National League wild card team . The National League of Professional Baseball Clubs , known simply as the National League ( NL ) , is the older of two leagues constituting Major League Baseball ( MLB ) in the United States and Canada , and the world 's oldest current professional team sports league .