D'Arnaud (hand) started his rehab assignment at High-A St. Lucie on Thursday. He went 1-for-2 with a walk and played the field for five innings. D'Arnaud, who suffered a fractured right hand when he was hit by an A.J. Ramos pitch on April 19, likely will need at least a week of rehab games to be ready for activation. When that does happen, he will slot right back in as the Mets' starter catcher with Kevin Plawecki going down to Triple-A Las Vegas.