Racing PositionsSeries preview: Mets vs. Nats7YAdam RubinDarvish won't start opener, to see specialist7YRichard DurrettNats agree with Snyder on minor league deal7YAngels add Snyder to mix for backup catcher8YOlivo tops Mets' free-agent catcher list8YAdam RubinShoppach highly unlikely to return8YAdam Rubin