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AP sources: About 10 MLB umpires opt out over virus concerns – WKRG News 5
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Giants catcher Buster Posey will announce retirement - Los Angeles Times
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Buster Posey's 18th Homer Helps Giants to Ninth Straight Win – NBC Bay Area
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Buster Posey increased workload for playoffs
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Timeline of how the COVID-19 pandemic has impacted the 2020 Major League Baseball season
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List of MLB players who opted out of 2020 season and why
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Giants beat Dodgers in playoff opener
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Brewers' Lorenzo Cain opts out of 2020 MLB season as league deals with COVID-19 outbreaks
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San Francisco Giants catcher Buster Posey to sit out season over COVID-19 concerns