The St. Louis Blues and Nashville Predators might be two of the most evenly matched teams left in the playoffs. Sure, you can point to the potent offenses of Washington and Pittsburgh. New York and Ottawa will be an interesting series too.
However, almost since their inception, the Blues and Predators have been evenly positioned against each other. Once Nashville grew out of their expansion diapers and put on big boy pants, it really became a rivalry.
The fact that these two teams have never met in the playoffs is almost surprising. Some of that has to do with the current format, but plenty has to do with both teams failing to live up to expectation on certain occasions.