MLB postponed the game between the Red Sox and the Yankees due to positive COVID-19 tests:

The Yankees’ post-All-Star break opener against the Boston Red Sox on Thursday night was postponed because of positive COVID-19 tests among New York pitchers Jonathan Loaisiga, Nestor Cortes Jr. and Wandy Peralta.

Aaron Judge, Kyle Higashioka and Gio Urshela are also in COVID-19 protocols, sources told ESPN’s Buster Olney.

Yankees general manager Brian Cashman said earlier Thursday that tests for three players were still pending, but he did not name them. He said he assumes the tests will come back positive.

All the Red Sox All-Stars who were in Denver have been asked to undergo additional testing on Thursday because they were told a Yankees All-Star had tested positive, sources told ESPN’s Marly Rivera. 

ESPN.com

The players who tested positive were vaccinated, and no one is appears to be sick.