Powerful videos from the families of Ahmaud Arbery and Trayvon Martin -- who thanked Naomi Osaka for her COVID mask tributes at the U.S. Open.
Osaka has been wearing a different name of a violence victim on her face coverings every day of the tournament in NYC ... hoping to bring awareness to Breonna Taylor, Arbery, Martin and others.
And, after her match on Tuesday -- ESPN surprised her with thank you video messages from the families of two of her mask honorees.
In the first, Martin's mom, Sybrina Fulton, praised the 22-year-old tennis player for her tributes .