Drafted in the 29th round (851st overall) by the Miami Marlins in 2000.
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Hoorelbeke is the son of Peter Rivera, the original lead singer, drummer and founder of the band Rare Earth. His brother Jesse is an outfielder in the Cubs system. Casey made a name for himself as a talented pitcher and basketball player at Coeur d' Alene (Idaho) High and transferred to Lewis-Clark State after pitching at North Idaho Junior College. After his first pro season in 2004, he moved to the bullpen where his low three-quarters arm slot and fringy three-pitch repertoire play best. He has a big, durable frame and an aggressive approach to pitching. He dominated at times in 2006 at Double-A before a viral infection slowed him in August, when he allowed 10 earned runs in seven appearances. His 88-90 mph sinker has average life and movement. His 10-to-4 slider is a fringe-average offering, as is his changeup. When he keeps the ball down in the zone he induces lots of ground balls. He has solid-average command and value as a middle reliever down the road. He was not placed on the 40-man roster and was Rule 5 eligible in 2006, but he wasn't taken in the draft and should spend most of 2007 in Triple-A.
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