I found Martynas Pocius

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:

Denham Brown

Andy Rautins

Patty Mills

Nick Calathes

Matt Freije (!)

Kirk Penney (!!)

JP Batista

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?