Bleacher Report is in London with JR SportBrief, grading Team USA's 109-83 semifinal win over Argentina in anticipation of Sunday's gold-medal game versus Spain.

Argentina stayed within striking distance of Team USA until midway through the third quarter, when the Americans took control. Who were the members of Team USA that JR thinks were the difference? Tune in to find out.

Watch as JR grades LeBron James, Kobe Bryant, Carmelo Anthony, Chris Paul and Kevin Durant's performances, and identifies which member of Team USA might not be getting as much time in the final because of his questionable play against Argentina.  

Also, find out which player continues to do all the little things to help make Team USA look unbeatable.  

Bleacher Report will be covering the 2012 London Olympics from every angle throughout the Olympiad, so stay tuned to Bleacher Report and BR's YouTube channel for all of your coverage.