This is the 10070th most frequent Turkish word.
basketbolcunun
"Of the basketball player" or "the basketball player's."
Here, 'basketbolcunun' means 'of the basketball player.' It indicates possession or association with the basketball player in the context of the action being described.
Basketbolcunun topu potaya doğru süratle fırlattığını gördüm.
I saw the basketball player rapidly throwing the ball towards the hoop.
In this context, 'basketbolcunun' still indicates possession, pointing out that the uniform belongs to the basketball player.
Basketbolcunun formasını bir hayran satın aldı.
A fan purchased the basketball player's uniform.
'Basketbolcunun' is used to denote the subject (the basketball player's) whose mood is being discussed in connection with the situation.