Please answer the following question by reasoning step-by-step.
If "A tennis player is serving the ball on a grass court." does that mean that "A tennis player is playing the final set in a large tournament."?\nOptions:\n- yes\n- it is not possible to tell\n- no

it is not possible to tell
Serving a ball does not imply playing the final set in a large tournament.

.

Final answer: it is not possible to tell