Later, MLB announced the rest of the series would be postponed, per Jayson Stark of The Athletic.
Friday's game was also postponed after the Cards' initial positive tests. Most of the positives are from staffers, per The Athletic's Mark Saxon.
St. Louis president of baseball operations John Mozeliak said the parties involved have been in communication about how to move forward.
"Having prompt reaction by everybody involved—commissioner's office, Brewers, Cardinals—I think it did prioritize safety, and that's important," Mozeliak told reporters Friday.
For the second straight day, Brewers pitcher Brett Anderson noted he found out the game was postponed via the media rather than the team or league:
In addition, Milwaukee center fielder Lorenzo Cain informed the club he's opting out of the remainder of the campaign:
MLB Commissioner Rob Manfred spoke with MLB Players Association executive director Tony Clark on Friday to alert the union the 2020 season could be in jeopardy if the positive cases aren't contained amid the coronavirus pandemic, per Passan.
The Marlins and the Philadelphia Phillies, their opponent in last weekend's season-opening series, haven't played since that head-to-head matchup.
It's created a situation wherein Miami and Philadelphia have played only three games, while other teams have finished as many as eight. Making up the games could prove difficult within a 60-game schedule that was already condensed because of the pandemic.