Novak Djokovic lost his momentum in the second half of last season and was toppled as the world No. 1 by Andy Murray because his work rate dropped, the Serbian's former coach Boris Becker said on Wednesday.
Speaking a day after the two terminated their cooperation by mutual consent, German Becker said Djokovic's need to spend more time with his family had derailed him on the court.
"He didn't spend as much time on the practice court in the last six months as he should have and he knows that," said Becker, who helped Djokovic to six Grand Slam titles after they teamed up in December 2013.
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