More than a dozen Marlins players and staff members tested positive for COVID-19 in an outbreak that stranded the team in Philadelphia, disrupting Major League Baseball’s schedule on the fifth day of the pandemic-delayed season. Miami’s home opener against Baltimore was postponed as was Tuesday’s finale of the two-game series at Marlins Park. Also postponed was the Yankees’ series opener Monday at Philadelphia, where New York would have been in the same clubhouse the Marlins used last weekend.