Watching Nikolay Davydenko play the most miserable set I've ever seen a pro tennis player play against Djokovic in Cincinnati this week, it looks like the cagey Russian might think seriously about retiring. Davy had cruised past Dolgopolov and Florian Mayer in the first two rounds of Cincy--but both of those guys are suspect, too, sometimes playing like world-beaters and other times playing like

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