Is It Too Early to Talk About Run Differential?

I hope so, because your Boston Red Sox have the worst run differential in baseball, scoring 25 fewer runs than they've allowed.

The good news, such as it is, is that the runner-up (runner-down?) for the run differential cellar is upcoming opponent the Minnesota Twins.
Texas leads the majors with +51.After 15 games -- 3.4 runs per game better than their challengers.

Run differential is generally considered a reliable predictor. The Nationals, a few years ago, actually had a winning record but a negative run differential at the All-Star Break. However, they came to Earth, brutally, in the second half of that season.