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Old 02-08-2013, 12:28 AM   #16
cork_screw
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Quote:
Originally Posted by tennis_pro View Post
It was a shot that led him to Madrid, FO, Wimbledon victories back in 2009. He kept using it in mid/late 2009 but with less and less frequency. Why do you think he switched back to his old game afterwards?
(eye roll)

He didn't stop using the drop shot 2009/2010. It's more like he started using the drop shot circa 2011 to present.

Do you know what confounders are? Look that up in the dictionary. A book printed as in Freakonomics utilizes this principle that is a result of absentmindedness.
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