The San Francisco Chronicle reports that Cluck, whose Texas Rangers lost to the San Francisco Giants earlier this year, posed with Newsom and the World Series trophy on Wednesday at San Francisco City Hall.
He then donned a Giants jersey and coached a youth baseball team in the city's Bayview district against a team coached by Newsom.
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Cluck described putting on the Giants jersey as "pretty painful," but said the team deserved to win and he was proud of them.
He also said he was the winner in the end because he got to visit San Francisco and perform community service.