Kārlis Lasmanis scored eight points for Latvia, Nauris Miezis and Francis Lācis added five points each, and Zigmārs Raimo had three points.
As already reported, in the tournament opener on Tuesday the Latvians beat Lithuania 21:14.
The Olympic 3x3 basketball tournament features teams from eight countries - Latvia, Lithuania, USA, France, China, the Netherlands, Poland and Serbia.
After an all-play-all tournament, the top two teams will qualify for the semi-finals, while the third to sixth-placed teams will compete in the quarter-finals on the evening of August 4. The medals will be distributed on August 5.
Latvia's 3x3 players will play two games on Thursday - at 11:30 Latvian time they will take on China, and in the evening session at around midnight they will play the USA.