Who fills in for Jose Fernandez?

The Miami Marlins are in a position of having to replace the irreplaceable.

Jose Fernandez was placed on the 15-day disabled list with a sprained right elbow Monday and will return to Miami for further evaluation following an MRI in Los Angeles. The Marlins believe the 21-year-old ace will need season-ending surgery, reports ESPN The Magazine's Buster Olney.