"The A's have said Henry Rodriguez can be a special reliever once he gets command of the strike zone. They saw enough from the hard-throwing right-hander to call him up from Triple-A Sacramento on Wednesday. Starting pitcher Vin Mazzaro was sent back down to make room for him. Rodriguez, 23, has been high on the A's radar for several seasons thanks to a fastball that reaches 100 mph. He made his big league debut with three appearances in September and earned his ticket back to the majors by cutting down on his walks with Sacramento. The right-hander didn't allow an earned run in eight appearances with the River Cats, striking out 14 and walking just three in 9?1/3 innings. Catcher Landon Powell began this season with Sacramento. Not only has Rodriguez harnessed his fastball, Powell said, he's added an effective slider." http://www.insidebayarea.com/athletics/ci_15026487