[Milwaukee Bucks' forward Giannis Antetokounmpo, center, jumps to dunk the ball during a friendly game in Athens, on Sunday, May 29, 2016. New York Knicks star Kristaps Porzingis joined fellow NBA player Giannis Antetokounmpo, of the Milwaukee Bucks, and his older brother Thanasis, for a game of streetball Sunday. The "Antetokounbros Streetball Event," organized by Eurohoops and the City of Athens, took place in an open court, at Greece's largest high school, and attended by 5,000 people. (AP Photo/Yorgos Karahalis)]ATHENS, Greece (AP) — NBA stars Giannis Antetokounmpo of the Milwaukee Bucks and Kristaps Porzingis of the New York Knicks battled it out in Athens in a game of streetball Sunday, watched by a crowd of 5,000.