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Even by baseball standards, the first quarter of the 2017 MLB season has been full of surprises.

But rather than gush over them, let's ask the blunt question: What's for real and what's not?

In times like these, it sure helps to have what we're calling the "B.S. Meter." It's just what it sounds like: a device with which to assess believability.

With the help of the latest and greatest in sabermetrics, it's now going to be applied to 10 breakout stars. The list consists of five top hitters and five top pitchers. Not all of them were completely off the radar before the season, but each is far surpassing what could've been fairly expected of them.

Starting with the hitters, let's get to it.