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Novak Djokovic believes it is possible for him to hold all four Grand Slam titles at the same time, as he goes in search of the, so far, illusive French Open crown.
The Serbian ace has had an unbelievable last 12 months and since his victory in the 2011 Australian Open, has gone from strength to strength and moved to the top of the rankings.
Djokovic followed up that win with victories at Wimbledon and Flushing Meadows, and then retained his Australian Open title earlier...
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