na-adjective, noun which may take the genitive case particle 'no', noun
strongest candidate; likeliest winner; top suspect
Used to describe the most likely or strongest contender in a competition, election, or investigation. Often modifies nouns like 候補 (candidate) or 容疑者 (suspect).
彼が最有力の候補者だ。
He is the strongest candidate.
この馬がレースの最有力馬と見られている。
This horse is regarded as the likeliest winner of the race.