Originally Posted by krosero
I don't know if I would say that the sample sizes of first and second serves should be more or less the same. Not if what you mean is a first-serve percentage of around 50%. I think a player could make around 70% of his first serves and you'd still be left with a sizable number of second serves.
I agree. One may say that the smaller sample should not be really small. If it is not very small then we may calculate percentages (success).