Washington Nationals player tests positive for COVID, 4 teammates in quarantine on opener eve

On the eve of the MLB regular season's start, Washington Nationals general manager Mike Rizzo announced a player has tested positive for COVID-19, while four teammates and a staffer are in quarantine.Why it matters: Major League Baseball is still reeling from the impact of the coronavirus last season, when sponsor revenue plummeted by up to 60% and players' salary also fell, as the pandemic shortened the season.Stay on top of the latest market trends and economic insights with Axios Markets. Subscribe for freeWhat they're saying: Rizzo didn't name the six affected people, saying officials were still "finding out exactly what their status is.""They're certainly out for tomorrow's game" against at home to the New York Mets, he added.Of note: While the Chicago Cubs' opening game on Thursday is set to go ahead with fans in the stands, the city's Office of Emergency Management is warning ballparks and bars would have to shut if a spike in COVID cases continues, per CBS.COVID positivity rate grew from 2.8% on March 1 to 4.5% by the month's end, CBS notes. More from Axios: Sign up to get the latest market trends with Axios Markets. Subscribe for free