PHILADELPHIA — It took exactly one game for the Mets’ biggest concern leaving spring training to become exposed.
Simply, the bullpen.
The worries in camp mostly focused on the depth behind Edwin Diaz, Trevor May and Aaron Loup, but in the season opener against the Phillies, two of those trusted commodities faltered, leaving the Mets 0-1 for the first time since 2016.
May and Loup, the two shiny new toys in the bullpen — they arrived on free-agent contracts over the winter — combined to allow five runs in the eighth inning, and the Mets never recovered in a 5-3 loss.
Miguel Castro, Jeurys Familia, Dellin Betances, Robert Gsellman and Jacob Barnes are the other bullpen pieces, but as manager Luis Rojas indicated Tuesday, it starts with May and Loup in the setup role. Call them options Nos. 1A and 1B.
“They are guys that have pitched in a lot of high-leverage scenarios in their careers and in recent history, and they have the stuff to navigate through the middle of the lineup and navigate through tough hitters like Bryce Harper,” Rojas said Tuesday before the Mets faced the Phillies. “Those guys are definitely key guys in the bullpen,…