Star rookie Jordan Zimmermann will likely be sidelined for a year and a half due toelbow surgery. (AP Photo/Manuel Balce Ceneta) Ay carumba — to think, we were all set for a tranquil evening on the sports front, with no local games on the schedule. We’re definitely sure, though, that this was not the kind of news that the Nationals were hoping for on their day off and after closing out two consecutive home…