nbc's kathy park is outside of yankees stadium in tbronx. good morning. >> reporter: the yankees played their home opener last night. under normal circumstances, the stadium would have been packed, about you it really has been unprecedented here for baseball with no fans inside, games postponed, and now the possibility of a canceled season. this morning major league baseball's short season is in jeopardy. espn reporting mlb's commissioner warned the players union the season is at risk if the virus isn't better managed. >> i signed up to play this year. i know the risks. >> reporter: teams reporting 29 coronavirus cases in the past week with two st. louis cardinals players testing positive friday, postponing their matchup against the milwaukee brewers. the league says a decision is consistent with protocols to allow enough time for additional testing and contact tracing to be conducted. eight different teams have been affected. the marlins have been sidelined for days after an...