Castillo went 1-for-4 with a solo home run Monday against the Cardinals.
Castillo opened the scoring in the second inning with his third home run of the season. That ended a 27-game homerless drought, and he's struggled mightily in general during that stretch by hitting just .158 with four RBI and six runs scored. He could be a candidate to lose playing time when either Kevin Newman (groin) returns or Oneil Cruz is recalled, but Castillo remains the Pirates' primary shortstop for the time being.