Allot of fantasy owners are waiting and walking on egg shells for results of Huston Street's MRI.  One thing I can guarantee is Street will open the season on the 15-day DL.  He has yet to throw in a spring training game, so he has to get some work in.  He felt great on Monday after throwing 25 pitches, but they felt "discomfort" on Tuesday.  When players use the word "discomfort" it is normally good.  It could be a number of non serious injuries, but is left open to a serious one. 
I don't want to give much analysis before the MRI results come out, but I've seen this before and I'm 85% sure that it will end up be a strained tendon or something along those lines.  It will be interesting to see what his retroactive date will be and when he will be available to pitch for your fantasy team.  IN the short term I expect Franklin Morales to get a few saves until Street returns.

ANALYSIS:
Huston Street has dropped in my closer rankings from 5 to 8, but the injury could help his draft value.  Allot of managers tend to stay away from hurt pitchers in the drafts, so he will likely fall at least two rounds in the draft.  That makes him a much higher value for a pitcher that will likely only miss two weeks of the season. 
I did have Street as a 8/10 on my injury risk scale.  You have to expect it from Street, but if he gets it out of the way early, it could be a great year for Street.  Look to draft him in the 10th round instead of the 8th round and you might even be able to draft him later.  He is still one of the better closers this season.