WITH CHRISTIAN WALKER’S STATUS UNCERTAIN, COULD CAM SMITH CRACK ASTROS’ OPENING DAY ROSTER?

ternoon opened myriad possibilities for general manager Dana Brown and manager Joe Espada, two men who’ve taken clear stances on promoting prospects. The severity of Walker’s injury is unclear, but Espada told reporters Thursday that the 34-year-old first baseman will travel to Houston for an MRI. The proximity to Opening Day, coupled with W