Jorge Alfaro is a lock to make the roster this year as he doesn’t have any more minor-league options left. That leaves Andrew Knapp and Cameron Rupp in competition for the backup spot.
Given how this spring has gone so far, it appears Knapp will be the one taking that backup spot. He has been much better defensively this spring, which is what the team is prioritizing. Knapp has caught three of six runners stealing, while Rupp has caught just two of 13. Both have performed about the same offensively.
Both can still be optioned to Triple-A this year, so nothing is set in stone. Todd Zolecki of MLB.com gives the edge to Knapp to make the roster. Personally, I would be more than happy with Knapp over Rupp.