ESPN reports on the revealed cases of COVID-19 among major league players. A number are reporting as asymptomatic. The most serious appears to be Freddie Freeman:

Braves manager Brian Snitker said Freeman had a fever but added it’s too early to know if the four-time All-Star’s status for the start of the season could be jeopardized. Snitker said concerns will remain even after the four Braves players return to workouts.

EPSN.com

So far, the number of infections should not prevent a season. We will see how well MLB and the players keep this from spreading.