That Djokovic has been playing too much tennis, which is why he retired at Cincy? He took a month long break after Wimbledon, and then one won tournament before Cincy. Mardy Fish, on the other hand, made what, 5 straight finals during the same time span? Djokovic's injury didn't come from playing to much, he got injured because he was playing like dooty during cincy. Thank you, have a good night.