Possibiliites of Scandal in Tennis?

With the things going on with MLB, NFL, NBA, and most sports, is there a way to alter a racket or tennis string to give someone an advantage that would make it a scandal?

I cannot imagine that tennis would ever have a scandal with equipment since they are allowing players to use paintjobs, modifications, and different sizes and setups. So tennis is probably going to be the cleanest sport in terms of equipment. Golf has regulations on size, length, and now with the belly-putter issue. What can the tennis equipment or string industry do that would not be allowed? Thoughts?
 

adventure

Banned
Sammy Sosa, I mean Stosur, uses pine tar on his racket. Look closely.

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