This is the age of the superteam in professional sports, and baseball is no exception. Three teams—the New York Yankees, Houston Astros and Los Angeles Dodgers—could finish the regular season with 105 wins, something that has never happened before. It has created the perception that the upcoming playoffs are little more than an anticlimactic undercard before an inevitable World Series matchup between two of these top dogs.

The Atlanta Braves see things differently. They’ve spent all year hearing that they exist only to be...