OAKLAND, Calif. -Shin-Soo Choo took the next step in attempting to convince the Rangers he belongs on the postseason roster. Choo headed to Arizona for at least three days to take as many at-bats as possible in instructional league games. He will be re-evaluated Thursday and could appear against Tampa Bay on the season's final weekend.Even though Choo's forearm appears healed from a fracture, there are no guarantees.