data-mm-id=”_o7fhf8bwu”>Rob Manfred issued a stark warning to Major League Baseball Players Association executive director Tony Clark, telling him the 2020 season could be shut down if the sport doesn't do a better job of managing the coronavirus. ESPN's Jeff Passan landed the scoop. MLB has seen a number of positive COVID-19 tests pop up since the season started last Thursday. The Miami Marlins have seen 18 players and two coaches test positive, while the St. Louis Cardinals reported two positive tests on Friday. On top of that, the Philadelphia Phillies are potentially facing an outbreak of their own after playing the Marlins over the weekend. So far the players have tested negative, but it can take several days for the virus to appear. Those issues have caused a number of …