Cubs pitching coach Larry Rothschild doesn't think an arm issue is the cause of Carlos Zambrano's struggles the past couple starts.
''It's news to me because he's done his sides.
He's done everything without any problems,'' Rothschild said.
''I've obviously seen him better, but you're not going to have your best stuff every start.
I don't know that that's the issue.
If it is, he's hiding it, which I don't think is the case.
'Big Z gave up seven runs last week in Houston and a 13-hit, six-run, zero-strikeout start Tuesday against the Cincinnati Reds.
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