Cubs manager Lou Piniella benched infielder Ryan Theriot on Monday and started Mike Fontenot in his place. "I'm not going to say one way or the other," Piniella said when asked how long the move would last. "This could be more than a one-day thing, yeah." Mike Fontenot, who is batting .337, started in place of Theriot and batted fifth on Monday against the Pirates. Theriot's slump has been so significant that Piniella had his numbers ready to recite. "One walk in one month," Piniella said of Theriot, who entered Monday batting .286 after staying over .300 for most of the season. "That's kind of hard to do."