Matt Murton hit a home run for Chicago.
Zambrano (0-1) allowed five runs (four earned) on four hits, walked three, hit a batter and struck out eight in his third start of the season.
A federal grand jury is investigating whether Barry Bonds committed perjury when he testified in 2003 that he never used steroids, a person with knowledge of the probe told AP on Thursday.
The person spoke on condition of anonymity because of the secrecy of the investigation.
The panel has been hearing evidence for more than a month about whether Bonds lied to a different grand jury that was investigating the BALCO scandal. The existence of the grand jury was first reported by CNN on Thursday.
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