Castillo was optioned to Triple-A Durham on Sunday.

EDGE Analysis

Castillo was one of four Rays pitchers sent down to minors camp prior to Sunday's Grapefruit League action. The 24-year-old right-hander, who produced a 3.38 ERA and 58 strikeouts over 42.2 innings at Durham last season, should be among the first callups to the big-league roster in 2018 when injuries inevitably hit the bullpen.