Carmelo Anthony

Another scare: US men's basketball team edges Serbia 94-91

Written in Portuguese on one wall above center court at Carioca Arena is the phrase "Um mundo novo." Translation: A new world.

It didn't seem that way in men's Olympic basketball — until now.

Threatened by Australia in its previous game, the U.S. men's team survived a heart-racing final seconds to defeat disciplined and experienced Serbia 94-91 on Friday night and extend its winning streak in international tournaments to 49 games.

No. 50 is no given, and suddenly, a gold medal that seemed a formality just a few days ago is anything but certain.

The Americans, boasting a roster stuffed with NBA All-Stars, elite outside shooters but only two...