11 MLB umpires have opted out of 2020 season, per report
How MLB Umpires Learned to Explain Replays to Crowds - The New York Times
Timeline of how the COVID-19 pandemic has impacted the 2020 Major League Baseball season
MLB outlines player safety plans in 80-page memo
1994–95 Major League Baseball strike - Wikipedia
AP Sources says 10 MLB umpires opt-out of 2020 season coronavirus
The 2020 MLB Two-Thirds Season Power Rankings - The Ringer
MLB notebook: Yankees' Boone gets 1-game suspension
Major-League Umpiring during the Pandemic of 2020 - Baseball ProspectusBaseball Prospectus
Several baseball players are opting out of the 2020 MLB Season, citing 'personal health and safety
Major League Baseball will allow fans to attend World Series in person - CBS News
Report: Umpires agree to development of automated ball-strike system – The Morning Call
USA Baseball Announces Inaugural 13U Athlete Development Program Roster