This is the 6234th most frequent Dutch word.
sivakov
"Sivakov" is not a Dutch word but rather a surname, often associated with Pavel Sivakov, a professional cyclist.
In this sentence, 'Sivakov' is used as the proper noun referring to an individual, presumably a cyclist.
Sivakov won de wielerwedstrijd met overtuiging.
Sivakov won the cycling race convincingly.
Here, 'Sivakov' refers to the person whose victory is being described, showing possession with context of accomplishment.
De overwinning van Sivakov bracht veel vreugde voor zijn team.
Sivakov's victory brought much joy to his team.
This demonstrates 'Sivakov' as the subject in the action of arriving at the finish heightened by cheering fans.