Definition of “front-runner” - Learner’s Dictionary

front-runner

noun [ C ] uk us /ˌfrʌntˈrʌnər/ US  /ˈfrʌntˌrʌnər/

the person or organization that will most probably win something:

She's the front-runner for the best actress award.

(Definition of “front-runner” from the Cambridge Learner's Dictionary © Cambridge University Press)