Tampa Bay Rays relief pitcher Diego Castillo closed out the Rays 3-1 win on Thursday. He now has four saves on the season, two of which have come in the past week. It seemed like Jose Alvarado was going to be the clear-cut favorite for closing duties shortly after the season began, but he has not logged a save in three weeks. Both Emilio Pagan and Castillo have logged saves since then. The situation has become a guessing game for fantasy owners, however, Alvarado is not out of the conversation. [...]