On Saturday morning, ESPN’s Buster Olney passed along the interesting fact that all five teams in the American League East has a negative run differential. The first-place Yankees are tied for the worst differential at -10 with the Red Sox, while the second-place Orioles are at -1, the third-place Blue Jays are at -6, and the last-place Rays are at -2.
It’s still early so run differential doesn’t mean a whole lot. But over a larger sample of games, run differential correlates strongly to winning baseball games. By this simple arithmetic function, we can conclude with a large grain of salt that the five AL East teams have played no better than average baseball to begin the season.
The only other division with three teams in the red in run differential is the AL West. The Rangers (-2), Mariners (-6), and the Astros (-51) have played subpar baseball. It’s… a bit of an understatement for the Astros.
-- Bill Baer, NBC's Hardball Talk