Minnesota Twins second baseman Jorge Polanco (back) will go on the injured list due to lower-back tightness. In a corresponding move, outfielder Alex Kirilloff is expected to be called up from the minors to join the Twins in Arizona. Polanco hasn't played since last Sunday, and he'll be out at least a little longer. The 28-year-old's MRI exam didn't show any major injury, so there's a good chance Polanco could return when he's eligible. Luis Arraez should continue to see most of the starts at...