FWIW the two most likely 3-way ties are Greece/Brazil/US at 4-1 each with US losing to Greece and beating Brazil, Greece winning both second round games, and Brazil beating Czech and losing to the US
First it would come to record in games among tied teams (tied 1-1)
Second point differential in games among tied teams (Brazil is +1, Greece is -1, USA

)
Third is points scored in games among tied teams (Brazil is 79, Greece is 78, USA

)
Fourth is point differential in all group games (USA +75, Greece +30, Brazil +20)
Fifth is points scored in all group games (USA 279, Greece 266, Brazil 265)
So by whatever margin the USA were to lose to Greece (X) by they would need to beat Greece by ((1 - X)/2) to at least move onto the third tiebreaker.