[Johan Kriek] Progress and Regress in Tennis

britbox

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Not strictly ATP so will move later but here is Johan Kriek's article on progression and regression.

http://www.tennisfrontier.com/blogs/johan-kriek/johan-kriek-on-progress-and-regress-in-tennis/
 

Moxie

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I look forward to catching up with this one. Thanks, Johan.