8:50 AM PT -- MLB reports two members of the Cardinals tested positive for the virus ... which is the reason for the rescheduling.
League officials add the game is expected to now be made up as part of a double-header on Sunday.
Saturday's scheduled contest between the two teams, meanwhile, is still on for now ... the league said.
Brewers GM David Stearns says he's on board with the league's decision, saying, "We are supportive of MLB's decision to postpone today's game and look forward to playing our home opener as soon as conditions safely allow."
"The health and safety of our players and employees are, and will continue to be, out top priorities."
More coronavirus issues for MLB ... the league has just postponed the Brewers vs. Cardinals game Friday due to multiple positive COVID tests, baseball insider Jon Heyman reports.
Unclear how severe the outbreak is or if any players contracted the virus ... Heyman reports several in the Cardinals' org. tested positive.
Of course, it's a big problem for baseball ... MLB had been already going through major issues with COVID as it tries to return to normalcy.
The Miami Marlins have been barred from playing until at least Sunday after they had nearly 20 positive cases on their team since last week.
The Philadelphia Phillies, meanwhile, had their series with the Toronto Blue Jays this weekend postponed after two staffers tested positive Thursday.
The outbreaks appeared to have been limited to just those two teams ... but Heyman's report Friday raises the question -- can the MLB finish its season?