I do like the cartoons. I came across the same idea last year while buying the cartoon album of Brazil 2014 WC called Colombia Humor 2014. It showed Colombian football (or soccer) players in caricatures and most of the WC stars.
I asked the drawer of that sticker album and he said he would be very interested n doing something similar in tennis.
However, I am more inclined for the ATP/WTA to launch a set of trading cards Worldwide. I have worked on it since 2013, while running my business. While I have traveled to Spain, Italy, France, England, China and Singapore promoting the cards, the fan response has been great yet no ATP/WTA player has supported me. Here is the link to facebook page. It will help me with ESPN to get a note or at least some coverage. Kids and collectors Worldwide WILL LOVE IT!
Non-official page of ATP trading cards https://www.facebook.com/pages/ATP-trading-cards/772654146187236.
Non-official page of WTA trading cards https://www.facebook.com/wtatradingcards.