White Sox manager Ozzie Guillen has admitted that he is worried about slugger Adam Dunn, who saw his average drop to .196 after an 0-for-5 night on Friday against the Dodgers. Dunn has struck out 53 times in 138 at-bats and he's 0-for-31 against left-handed pitchers. "It's hard for me because I have never seen him play every day," Guillen said. "I know he is going to strike out a lot. "I'm concerned this doesn't get to his head and he loses his confidence."