Tyler O'Neill or D.J. Peterson -- who gets called up first?
What happens if the rookie first baseman isn't ready?
Was Gallardo a better choice than Hammel?
The Mariners traded for speedster Jarrod Dyson to bolster the outfield.
Is time running out for former top prospect D.J. Peterson?
By bolstering the back end of their bullpen, the Mariners can better use Edwin Diaz.
The former No. 3 overall pick is having a rebound year for the Mariners.