New rules coming to MLB for shortened 2020 season

The designated-hitter rule is part of health and safety protocols and will be used in both leagues. Extra-innings will begin with a runner on second. Players testing positive to COVID-19 will go on a separate injured list.
Major League Baseball (MLB) will implement a set of new rules during the shortened 2020 season.
The designated-hitter rule is part of the health and safety protocols and will be used both in the American and in the National League in 2020.
Extra innings will bring another relevant rule change. Each half-inning will start with a runner at second. The batter who made the final out in the previous inning (or a pinch-runner for that batter) would be that runner.