The hamate — a tiny bone that connects the hand and wrist — was fractured. He had surgery in Pennsylvania on Sunday and returned to Mets camp by Wednesday morning. Written on his cast were the names of his parents, girlfriend and son and that of his second child due later this season.

Francisco Alvarez underwent surgery on his left hand Monday after fracturing the hamate bone during a live batting practice session on Saturday. He is expected to miss between six and eight weeks, though a timetable is fluid,