I could be wrong. But I think the thing that makes stats like that hard is that a lot of table tennis matches are mismatches. The drop off in the level of players below top 10 is dramatic. And so you will have players in the top 30 losing most of their own serves when playing against a player in the top 5. And a player in the top 5 winning most of his opponents serves when there is a mismatch.
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Whereas, in a sport like tennis, even someone who is below top 100 can have an amazing serve sometimes. And without quite a good serve it would be hard to get in the top 300 in tennis.
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Also, what makes a really good serve in tennis is so different from what makes a really good serve in TT.
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I am talking theory. And I am talking from not really having paid attention to tennis for decades.
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And return of serve, the skill in tennis is also totally different. You have to be able to pull the trigger on committing to return a power ball if you want to be good at return of serve. It is about handling the return of a ball coming at you at pretty high speeds. And if you are passive and are not trying to give back a ball that is hard to handle, you are going to get crushed.
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With TT the skill is something completely different and so much is about reading spin and handling spin.
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So, not sure the stats in percentage of wins on serve in TT would actually be as meaningful as in a sport like tennis.
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Again, I am not really sure on this subject. But I have a couple of friends who are pro tennis players. And from watching years ago and from listening to things they have said, I think what I have said may be somewhere near enough to the target.