This is the 5958th most frequent Polish word.
zwycięzca
Winner.
The noun 'zwycięzca' is used to describe a person who has won a competition or contest, here referencing the marathon winner.
Zwycięzca maratonu otrzymał medal.
The winner of the marathon received a medal.
In this sentence, the noun 'zwycięzca' is used in a general and figurative sense to signify a successful person in a particular domain.
Każdy chce stać się zwycięzcą w swojej dziedzinie.
Everyone wants to become a winner in their field.
Here, the plural form 'zwycięzców' (genitive) is used to indicate multiple individuals who were successful in a contest.