This is the 9631st most frequent Polish word.
wyścigu
"Wyścigu" means "of the race" in English.
Here, 'wyścigu' is also in the genitive case, indicating the indirect object influenced by anticipation.
Nie mogę się doczekać kolejnego wyścigu.
I can't wait for the next race.
The word 'wyścig' here denotes a competitive event, specifically a race. It is used in the nominative case.
Mam nadzieję, że wygram ten wyścig.
I hope to win this race.
In this sentence, 'wyścigu' is in the genitive case, describing possession and connection to 'zakończenie' (the finish).