MLB: San Diego Padres at Colorado Rockies

Rockies All-Star outfielder Charlie Blackmon, left-hander Phillip Diehl, and minor-league pitcher Ryan Castellani have all tested positive for the coronavirus, reports Kyle Newman of The Denver Post. According to Newman, the three players tested positive following recent workouts at Coors Field in Denver and received their results late last week. Newman also reports that all other players who had been working out at Coors Field tested negative. 

This news comes not long after multiple major-league spring training facilities were closed because of a coronavirus outbreak

Blackmon, who turns 34 on July 1, is a four-time All-Star, and he becomes the most notable MLB name to test positive for coronavirus. Diehl, who soon turns 26, pitched 10 games for the Rockies last season, and the 24-year-old Castellani reached the Triple-A level for the first time in 2019 and is on the team's 40-man roster.

News of these positive tests comes on the same day that MLB and the Players Association finalized a structure for the 2020 season, which has been put on hold and will be limited to just 60 games because of coronavirus. 

The positive tests for the trio of Rockies is an acute reminder of the challenges that lie ahead for MLB as it attempts to cobble together a season in the midst of a pandemic. It's a positive and necessary step that a schedule has been set and health and safety protocols have been agreed to by league and players. But the state of the virus will have the ultimate say on whether the 2020 season gets underway and lasts until completion. Even as the season comes together on other fronts, nothing can be assumed.