With the 20th anniversary season of the Marlins coming up, I want to ask all Marlin fans out there one question: within the National League, who do you think is the team's biggest rival? I say within the NL because it's obvious that they are rivals with the Rays.
In my opinion, the Marlins' biggest in-league rival is Atlanta. Another Southern metropolis, not to mention they met in the NLCS 15 years ago, which so far has been the high point of the rivalry.
The playoffs should expand eventually, but only if MLB itself expands.
See my blog for more info.