Emotions got the best of both the St. Louis Cardinals and Cincinnati Reds on Tuesday night.
Reds second baseman Brandon Phillips made comments a few days earlier about the Cards that didn't sit well with St. Louis catcher Yadier Molina.
Before the bottom of the first inning, the pair got into a heated argument and the benches cleared.
Managers Tony La Russa and Dusty Baker got involved. So did starting pitchers and former allies.
With a playoff chase on the line and bad blood, this rivalry won't be going away anytime soon.
Here are five reasons why St. Louis and Cincinnati just made the race atop the NL Central division that much more interesting.