Warning: 90 MPH fastballs will make your face fall off.
Taking a baseball to the face at that speed can even make a few wince at just reading it in a sentence. For the unimaginative, here's a picture of Astros prospect Delino DeShields and the right side of his face going, "Uh uh. I didn't sign up for this. I'm out. You're doing too much."
As for what the injury is:
Luhnow: Delino DeShields has a non displaced maxillary sinus fracture (left cheek). He will be further evaluated today. Absence time TBD
In other words, ouch. Hopefully he gets better soon though.
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[via Tanner Case]