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LONDON -- Novak Djokovic knows just what it means to have to live up to lofty expectations after years of titles and trophies.
He's 39 and is a 24-time Grand Slam champion who now plays only sparingly.
So he is better positioned than almost anyone else to analyze what Serena Williams -- a seven-time Wimbledon singles champion just like he is -- must have been feeling after losing at the All England Club earlier this week in the first singles match that she played in nearly four years.