Travis Hafner will undergo an MRI on his sore right shoulder and will miss at least a couple days. This would explain why Vernon Wells is DHing tonight against Felix Hernandez. This could also explain Hafner's drop off in production for the past week. He has put up a .118/.211/.176 in the last seven days and currently has a 23 wRC+ in the month of May after putting up an astronomical 193 wRC+ in April.
This is probably coming as no surprise to anyone; Hafner has played over 100 games in a season exactly once (2010) since 2007. Coming in, Hafner's injury history was obviously well known and even more so, expected, so the Yankees will be prepared for a possibly Hafner-less Yankees lineup. The problem is that they signed him thinking he would simply be a complimentary piece that could perform or be gotten rid of. They weren't expecting him to be an important cog in the lineup until after losing Curtis Granderson, Mark Teixeira and Derek Jeter. He has already contributed 0.6 WAR in 32 games, which is about equal to his 0.5 WAR from last season in double the amount of games.
If this injury is serious then it's a good thing that it happened when it did. Curtis Granderson coming back on the same day Hafner goes down sounds like a fair trade. We'll see how this turns out, but as history has shown, the outlook does not look good. Maybe he ends up returning and contributing, but the injury bug will find him at some point; it always has. We knew what we were geting ourselves into.
UPDATE: Travis Hafner has shoulder tendinitis and could be available Wednesday.
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