With Spring Training now in full swing, the San Francisco Giants have unofficially began their journey to repeat as World Series Champions.

After their improbable run to become baseball’s 2010 World Champions, it is hard to say whether this team has yet to come down from that high.

A pretty mediocre and quiet offseason from the Giants’ front office has this team against the odds once again.

That is, until you look at their pitching staff, when you quickly remember why this team won it all last season.

Still, there are question marks aplenty for this team.

Can they repeat? Will Brian Wilson’s beard rule the world? Who is “The Machine?”

Here are my five biggest question marks for the San Francisco Giants heading into the 2011 MLB season

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