The Astros have sent outfielder J.D. Martinez down to Triple-A, CBSSports.com's Danny Knobler reports.
Martinez, 25, struggled mightily in 2012, as he hit just .241/.311/.375 (86 OPS+) after he posted a sharp 104 OPS+ in his rookie year of 2011. The Astros expressed a desire for the outfielder to hit every day. The Astros starting outfield will likely be Chris Carter in left field, Justin Maxwell in center field and Fernando Martinez in right field.