I really don't know, this is a total guess. I don't have an real knowledge but since there is a number you didn't think it was a runner, but what if they ran the race with a number, maybe they signed it with that number and handed their shoes over.
But its the style of the letter, agian with no real knowledge but my guess would be a basketball player from China.
Hopefully, someone has real knowledge to help you more, but that's my 1.5 cent opinion. You can send me a check if you find out I am right!
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