I checked the tv listings and didn't see the game for the US vs. Puerto Rico anywhere. NBC is going to be screwed in their ratings if they aren't going to be showing the US. Oh well its NBC's fault for thinking the US was a shoe-in for the semifinals.
NBA.com TV I think. nba.com -At the top of the page is this: TV SCHEDULE World Basketball Championship United States vs. Puerto Rico 9 p.m. ET Friday, NBA TV