Originally Posted by krosero
My question now is basically, we know it can happen with some regularity and in some ways it's not a surprise, but how often does this happen? How often does the figure for second serve end up higher than first serve?
I suppose that such information can be found in tennis databases.
By searching such a database we can get the number of matches in which players had more success on second serve than they did on first serve.
If we know the total number of matches in a database and a number of matches which fulfill this condition, we could easily calculate percentages.