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This comes following the example of other teams protesting the police shooting of Jacob Blake in Kenosha, Wisconsin in recent days.
The teams took the field at Minute Maid Park in Texas, held a moment of silence and exited.
This happens to fall on the day known as Jackie Robinson Day.
A's manager Bob Melvin says his view on the baseball holiday was different today than in past years.
They are now slated for a doubleheader tomorrow, Saturday, August 29.
Powerful message of unity between two division rivals. pic.twitter.com/kW9XvoyUtT— Casey Pratt (@CaseyPrattABC7) August 29, 2020
The A's and Astros will play a doubleheader tomorrow in Houston. #RootedInOakland— Casey Pratt (@CaseyPrattABC7) August 29, 2020