In several sports, the United States picks its Olympic team through one trials meet where finishing position alone decides selection. The approach is unusual internationally and deliberately so.
One meet, one result
In the sports that use this system, an athlete who finishes outside the qualifying positions at the trials does not go, regardless of season form or previous medals.
There is no discretionary override for a favorite having a bad day. The competition is the selection, and the result is applied as written.
Athletes must still have met the international qualifying standard separately, so the trials determine who among the eligible athletes takes the available places.
Transparency is the main argument for it
Committee selection requires judgment about form, matchups and potential, and any such judgment can be contested by an athlete who was left out.
A results-based trial removes that argument entirely. The criteria are known months in advance and applied identically to everyone in the field.
It also reduces the influence of reputation and sponsorship. An unknown athlete who wins the final is on the team, which is not guaranteed under a discretionary system.
The cost is occasional selection error
A single competition cannot fully measure form. Illness, a false start or an unlucky heat can eliminate an athlete who would have been the country's strongest entry.
Nations using committee selection avoid that specific failure by weighing a body of results, and they sometimes send athletes who would not have won a trials meet.
The American system accepts this cost explicitly, treating the fairness of a clear rule as worth more than the occasional loss of a likely medalist.
Timing creates a preparation problem
The trials sit close enough to the Games that athletes must peak twice within a short period, which is difficult in sports built around a single annual peak.
Coaches manage this by treating the trials as part of the preparation rather than as a separate target, tapering less than they would for a final.
Getting that balance wrong is a real risk. An athlete who peaks perfectly for the trials may arrive at the Games slightly past his best condition.
Not every sport uses it
Team sports obviously cannot select this way, and sports with subjective scoring or complex international quota rules typically use a mixed process combining results with committee discretion.
Even in those sports, published selection procedures set out in advance what will be considered, which is a version of the same transparency principle.
The result is a national system that is unusually rule-bound overall, and athletes plan multi-year training cycles around a document rather than around a selector's preferences.