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The hard-thrower made his major-league debut last season and is considered a top prospect<p>Here’s some potentially troubling news regarding the Cardinals and gifted rookie right-hander Alex Reyes: Reyes will undergo an MRI on his throwing arm, reports Derrick Goold of the <i>St. Louis Post-Dispatch</i>. …

Read more at CBS Sports: http://www.cbssports.com/mlb/news/cardinals-rookie-alex-reyes-to-undergo-mri-on-pitching-arm/