In response to phxvlsoxfan's comment:
Don't see any way we start the season with 3 lefties out of the pen, unless Morales assumes the inning eater role that Aceves had a couple years ago, and Aceves is moved or released. Breslow may be odd man out if Miller has a strong spring in the specialist role.
As others have said, I think Tazawa makes the opening 25, and likely could be the main set up man.
There will be trades before April (Morales and Mortensen may have value and maybe someone will gamble on Bard or Aceves), and I wouldn't be at all surprised to see 8 relievers on the opening day roster, with just 3 fielders on the bench (Ross, Ciriaco and OF/1B TBD).
The pen looks deep, especially if they stay healthy and if at least 2 of Hanrahan, Bailey, Aceves and Bard pitch like they did prior to 2012.
Breslow was signed for 2yrs and although hes a lefty, hes not a loogy. He has very good spits agains RH AND LHH...Miller is the loogy and Morales the long-man/spot starter. All three have different jobs.