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Novak Djokovic soaring; Roger Federer flailing as the season winds down
When one of the big four falters, there's another one around to pick up the slack. Last week's Shanghai Masters was a typical example.
With Andy Murray out after back surgery, Roger Federer continuing his slide and Rafael Nadal a little off his game, Novak Djokovic stepped forward to collect the crown and maintain the group's collective grip on the big titles.
Individually, however, the four are taking eminently divergent paths through this last part of the season.
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