Castro was signed by the Atlanta Braves in 2004, and began his professional career in 2005 with the GCL Braves. He went 0-2 with a 9.82 ERA that season. In 2006, he again pitched for the GCL Braves, improving to 1-2 with a 5.32 ERA. He split the 2007 season between the Danville Braves and GCL Braves, going a combined 2-2 with a 3.82 ERA. In 2008, he pitched for the Rome Braves, going 5-6 with a 4.98 ERA. He began 2009 with Rome as well.[1]
World Baseball Classic
In the 2009 World Baseball Classic, Castro appeared in one game, allowing three earned runs in two innings of work.[2] All three runs came off of a home runs Miguel Olivo.[citation needed]