Dressage at Devon is one of a handful of shows to host a masterclass in North America.
Read MoreIn February, Griner was arrested in Russia for possessing and smuggling drugs for criminal purposes and sentenced to 9 years in a Russian prison which her lawyers claimed was extravagant.
Read MoreOn Feb. 17, Brittney Griner was arrested in Russia for possessing and smuggling drugs for criminal purposes and in August, she was sentenced to 9 years in a Russian prison.
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