The Diamondbacks have placed ace Brandon Webb on the disabled list because of tightness in his pitching shoulder. The move was made retroactive to Tuesday. "I feel like we're making progress on it, but we just need a little more time to make sure it's totally good," Webb said. Webb tested the shoulder by playing catch on Sunday. "There's no concern," he said. "The MRIs are all good. I mean, if there's no structural damage, there's nothing to worry about."