The Mets played until nearly midnight, battling through a lightning delay and torrential downpours for nearly two hours Thursday night at Citi Field. When they resumed play in a tie game in the bottom of the eighth with one out and the bases loaded against the Nationals’ Kyle Finnegan, Mark Canha gave them all they needed with a fly ball to right field that was deep enough to score Pete Alonso. Alonso came sliding in just ahead of the tag to help the Mets (48-54) defeat the Nationals, 2-1. Every win is crucial for the Amazins’ right now and this one was no different.