Chris Johnson is expected to remain the Diamondbacks' starting third baseman next season. "Depending on (Willie Bloomquist's) health, shortstop is probably more of a concern than third base," general manager Kevin Towers said. Johnson is batting .296/.326/.533 with seven homers in 40 games since arriving in Arizona, which is significantly better than his career .277/.316/.433 line. If he falters, the D'Backs could turn to Ryan Wheeler, and they also have top position prospect Matt Davidson not far away.