Cardinals top prospect Shelby Miller now pitching at Double-A

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The Cardinals selected Texas high school pitcher Shelby Miller with the 19th overall pick in the 2009 MLB Amateur Draft, confident that his sharp high-90s fastball could one day make him a major league ace.

That day may be coming soon.

Miller was promoted to Double-A Springfield last week after opening the 2011 season with a 2.89 ERA and a dominant 81/20 K/BB ratio over 53 innings at High-A Palm Beach. He struck out 140 batters in 104 1/3 innings last season with Low-A Quad Cities, issuing only 33 walks along the way.

This winter, Baseball America rated Miller as the 13th-best prospect in baseball. ESPN’s Keith Law had him as baseball’s No. 4 prospect last week.

The 20-year-old right-hander made his debut for the Springfield Cardinals on Friday in front of friends and family in Corpus Christi, Texas. He allowed just one earned run over six strong innings, fanning five batters against two walks and scattering seven hits to earn his first career victory above the Single-A level.

Derrick Goold of the St. Louis Post-Dispatch ran a quick profile of Miller late Saturday night. The Cardinals, who preach a pitch-to-contact approach with most of their starters, have been slowly molding his off-speed stuff to be as effective as his signature heater. Instead of throwing a looping curveball like he did in high school, Miller now has a “power curve” that is tighter and pairs better with his fastball.

Miller could jump to Triple-A Memphis by the start of next season and could arrive in the majors by mid-2012.

Report: Welington Castillo to be suspended 80 games for violating Joint Drug Agreement

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Ken Rosenthal of The Athletic confirms a report from journalist Américo Celado that White Sox catcher Welington Castillo will be suspended 80 games for violating baseball’s Joint Drug Agreement. Castillo was believed to have used a steroid, but according to Rosenthal, the substance was not a steroid. More details should come on Thursday.

Castillo, 31, entered Wednesday’s action batting .270/.314/.477 with six home runs and 15 RBI in 118 plate appearances. He has gotten the bulk of the work behind the plate, backed up by Omar Narváez.

Castillo’s absence will likely prompt the White Sox to call up Kevan Smith from Triple-A Charlotte. Smith battled an ankle injury in March and April, so he got a late start to the season. In 102 PA at Triple-A, he has hit .283/.343/.457.