Rob Manfred reportedly believes the uptick in MLB's coronavirus cases is due to players not properly following protocols ... and now, he's threatening to end the season over if players don't fall in line quick.
ESPN's Jeff Passan just dropped the bombshell report ... saying the commish spoke with MLBPA executive director Tony Clark on Friday, and warned him the season will come to a screeching halt if teams can't get COVID cases under control.
Per the report, multiple players are afraid Manfred could pull the plug on the season as early as Monday if positive coronavirus cases continue to crop up.