Former Duke player Martynas Pocius is playing for Lithuania in the FIBA championships.
College basketball reference page here
Statsheet page here
He is not playing too bad for Lithuania so far, averaging 6.5 points and 2.5 rebounds. He currently plays for a club in Lithuania and will likely be representing them for years to come.
Other former college players include, but not limited to:
Matt Freije (!)
Kirk Penney (!!)
It's always interesting to see what former college players catch on in international competitions with their home country. Some great names in the list above, any I missed?