a one-horse race
A competition in which one participant is superior to the others and thus more likely to win. After interviewing all of the job candidates, it's clearly a one-horse race. Nobody can beat Kim's experience and qualifications.
a one-horse racemainly BRITISH
If a contest is a one-horse race, it is obvious even before it starts that one person or team is much better than the others and will win. Marseilles are threatening to turn the French championship into a one-horse race. The election was a one-horse race really, the president winning by a massive majority.