Because he is DONE. He could not get it done in yesterday's game and allowed a homerun to Varitek that blew the save, and now today has been just a complete mess. Rivera's not hitting his spots at all, hitters aren't scared of him, he clearly can't get it done anymore. A 3-2 Yankees lead is now a 6-3 Red Sox laugher. Rivera is to blame. Two blown saves in a row, velocity down, location way off, retirement soon to come.