David Letterman, former "Late Show" host started off his round of Qs for the 2-time champ with probably one of the hardest questions sports, which was asking about Durant's "KD" nickname ... which, has been a mystery among fans for some reason.
"Why do people call you KD??" Letterman asked.
As tough as this question was to answer for Durant, he explained it and explained it well. Now let's all just hope that David Letterman understood the explanation.
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SOURCE: TMZ