Questions & Answers about Мой брат хорошо играет в баскетбол.
In Russian, when you play a sport or a game, you normally use the verb играть with the preposition в + the accusative case:
- играть в баскетбол – to play basketball
- играть в футбол – to play football/soccer
- играть в шахматы – to play chess
So в баскетбол is the standard pattern: играть в + [name of game/sport in accusative].
Saying играть баскетбол without в is not correct in standard Russian.
Баскетбол is in the accusative case, because it is the object of the verb играет in the pattern играть в + accusative.
For inanimate masculine nouns like баскетбол, the accusative form is identical to the nominative:
- Nominative: баскетбол
- Accusative: баскетбол
You know it is accusative here not from the ending (which doesn’t change), but from the preposition в and the verb pattern играть в + accusative.
Russian uses different prepositions depending on what you play: