Because, of course.

From Buster Olney:

As the Seattle Mariners have been in discussions with Felix Hernandez about a record-setting extension, concern has developed over the condition of his pitching elbow, a source says.

The elbow issue is perceived by at least one of the parties in the deal as being a possible impediment to the completion of the new contract.

"It's an issue," said one source.

It may not be anything serious, or even semi-serious. And it may not even threaten the contract, so says Bob Nightengale who broke the original story on Felix's extension.

Felix Hernandez knows elbow became "issue'' after his physical , but both sides say still hoping to complete$175 million deal #mariners

— Bob Nightengale (@BNightengale) February 10, 2013

So maybe it'll all be fine. Dave Cameron offers some calming words on the subject that I encourage you to read.

But, you know, mariners.