MLS entered the competition in Round 4, and proved to be far and away the superior sides, going 10-1-4 (3-1 in shootouts) in their games against lower competition. Only the New York Cosmos (winning 4-3 in PKs after a 2-2 draw) and the Charlotte Independence (1-0 win) advanced from the lower tiers.
While MLS has the better record, many of the teams had to work for it, as six of those games went into extra time or a shootout, while another extra-time game had a plot line so unbelievable Hollywood could never have come up with anything like it.
Here is a brief recap of each Third Round game with links to the full match report (Check back as more will be added).
UPDATE: The Round of 16 draw was conducted by the US Soccer Federation on Thursday morning.