The star-studded US team were all over Brazil in a 122-87 triumph while Germans outlasted Greece 76-63 after a poor start.
Both now face opponents on Thursday they beat in the group stage and in pre-Games tune-ups.
The US will be up against World Cup runners Serbia who overcame a 24-point deficit in the first half to beat Australia 95-90 in extra time.
Germany face another date with hosts France who beat fancied Canada 82-73 even though their star Victor Wembanyama only managed seven points.
US stars roll on
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