Mariano Rivera was hurt catching flyballs during batting practice in Kansas City on Thursday night. He is going to have an MRI Friday. No one knows how bad this is going to turn out, but the pain/agony/concern on the face of Mariano Rivera and his teammates didn’t make it seem like a very minor injury. David Robertson or Rafael Soriano would slide into the closer role if Mo misses significant time. The Yankees are currently in 4th in the AL East, 4 games back of Tampa Bay.