San Francisco Giants' Buster Posey opts out of 2020 season
Giants catcher Buster Posey placed on seven-day concussion disabled list – The Denver Post
Retired Giants catcher Buster Posey goes back to school to complete his degree from Florida State
As Posey opts out, Giants begin new era under Gabe Kapler - The San Diego Union-Tribune
Citing the Pain of a Demanding Job, Buster Posey Retires at 34 - The New York Times
Buster Posey opts out of 2020 MLB season, Rodriguez, Thomas & Rosenthal react to decision
Giants catcher Buster Posey will announce retirement - Los Angeles Times
Posey out for 2020 as MLB teams deal with churning rosters
The Giants and Buster Posey have had preliminary talks about an extension - NBC Sports