This story was excerpted from AJ Cassavell’s Padres Beat newsletter. To read the full newsletter, click here . And subscribe to get it regularly in your inbox.

SAN DIEGO -- Last spring, Mason Miller burst onto the scene as one of the most electric relievers in baseball. Sporting a triple-digit fastball and a putaway slider -- with excellent command as well -- Miller racked up saves in his first 11 opportunities at the back end of the A's bullpen.

And then -- like every closer -- he let one get away. He blew his first save . He shook off catcher Shea Langeliers, who had called for a slider, then threw a fastball that Rays outfielder Jose Siri launched into the left-field seats at Tropicana Field.

To say it shook Miller would be an overstatement. But Miller also acknowledged tha

See Full Page