The St. Louis Cardinals have had two players test positive for COVID-19, resulting in Major League Baseball postponing Friday afternoon’s game at the Milwaukee Brewers, it was announced.

MLB’s quick decision to postpone Friday’s game, which was scheduled for 2:10 p.m. ET, comes after the outbreak within the Miami Marlins, who have had 20 positive tests — 18 by players after another Friday, sources told ESPN — over the past eight days.

The postponed game been rescheduled as part of a traditional doubleheader on Sunday, with the first game to start at 2:10 p.m. ET. Saturday’s game remains scheduled for 7:10 p.m. ET.

MLB said the postponement allows enough time for the Cardinals to do additional testing and conduct contact tracing. A source told ESPN’s Jesse Rogers that if what is happening with the Cardinals had occurred before the Marlins outbreak, Friday’s game at Miller Park would still be played.

“We are supportive of Major League Baseball’s decision to postpone today’s game and look forward to playing our home opener as soon as conditions safely allow,” Brewers president/general manager David Stearns said in a statement. “The health and safety of our players and employees are, and will continue to be, our top priorities.”

The Cardinals last played at the Minnesota Twins on Wednesday night.

That brings the number of teams being held out of action on Friday to six. The Brewers and Cardinals will join the Marlins, Philadelphia Phillies, Washington Nationals and Toronto Blue Jays as teams affected by the fallout from positive tests.

The Cardinals’ positives represent the first positive tests the sport has seen outside of the East Coast since the regular season started last week.