It didn't take long for Ozzie Guillen to know his new free agent slugger Adam Dunn was in store for a rough season.

In fact, the former Chicago White Sox manager didn't even need to see Dunn in a regular season at-bat to forecast trouble. Sitting in his Scottsdale, Ariz., office on the first day of spring training, Guillen was approached by then-hitting coach Greg Walker, who had just watched a batting practice session with Dunn, Paul Konerko, Carlos Quentin and A.J. Pierzynski.

"He says 'We have a problem,' " Guillen said Friday on "The Waddle & Silvy Show" on ESPN 1000. "I say 'What? Spring training is only a couple of days [old].' He says 'You've got to come out and see Adam Dunn's swing.' I said 'Don't worry about it. We've got a month and a half to get ready, go through spring training. Don't worry about it.' "

Guillen, who is entering his first season as Miami Marlins manager, eventually relented and saw Dunn for himself.

"I looked at his swing and I told [bench coach] Joey Cora going home, 'We've got a big problem,' " Guillen said.