The 3 1/2 years and $42 million left on Alex Rios' contract no longer guarantees him his starting center field position, general manager Ken Williams stressed Wednesday.

"Throw the contracts and salaries aside," Williams said as Rios was benched in favor of recently promoted Alejandro De Aza from Triple-A Charlotte. "If we have $20 or 30 million sitting on the bench, then that's a Kenny Williams problem. That's not (manager Ozzie Guillen's) problem. We'll have pretty good pinch-hitters."

In addition to his .208 batting average, Rios was batting .159 in 82 at-bats with runners in scoring position, .059 (2-for-34) in the same situation with two outs and 0-for-8 with the bases loaded.