Russian has free word order. So the the syntactic role of a noun is usually determined by morphology. Yet there are some indeclinable nouns and nouns for which say Accusative and Nominative forms do not differ.
Let's consider a sentence about two football clubs, "Lokomotiv" and "Dinamo":
"Динамо" побеждает "Локомотив".
To me it is unclear from this sentence who really wins - the "Динамо" or the "Локомотив". Even the intonation does not help here to resolve the ambiguity.
When I was in first grade I asked a teacher about such sentences (Another example being "Добро побеждает зло"), and she said it is the SVO (subject-verb-object) word order that should be assumed by default. I still wonder whether there is such real rule?