Stephenson will open the season on the 10-day injured list after being diagnosed with a low-grade oblique strain, Gordon Wittenmyer of The Cincinnati Enquirer reports.
Stephenson underwent tests for what had been described as a back injury, but an MRI revealed a strain to his oblique. That the strain is considered minor gives Stephenson a chance to keep his IL stint brief, but oblique issues can linger. With Stephenson out, Jose Trevino will open the season as the Reds' top catcher. Cincinnati has just two catchers on its 40-man roster, which leaves non-roster invitee Austin Wynns as a good bet to be the No. 2 backstop when camp breaks.