Novak Djokovic's new coach Boris Becker wins Wimbledon in 1985
"He had a couple of bad losses this year in the finals of the Grand Slams. He's such a winner and wants to win so badly and wants to go into the history books of tennis," said Becker.
"The fact Nadal has taken over and Murray has moved up a gear, he was left behind a little bit - I'm talking on a really high level, the last five or 10% that maybe has been missing for whatever reason.
"He decided he needed somebody in his corner that had been there and done it, and that's why I'm coming in."
The arrival of Becker on Djokovic's coaching staff will put him against Ivan Lendl, Murray's coach, who Becker beat three times in Grand Slam finals.
"When Ivan was appointed, I thought about what took some of these guys so long to talk about some of these all-time greats," added Becker.
"There was a generation that really changed tennis and the way we played in the 1980s is not that different to how we're playing today."
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