Djokovic has boasted throughout the season about how he has more energy on the tennis court, beginning a gluten-free diet, cutting pizza and bread of everyday life. But the most senior Serb was reluctant to discuss his new plan in detail, letting his game do the talking.
The man replies, Igor Cetojevic, Serbian doctor and a dietitian, who began working with Djokovic at the end of last year.
"I checked her to see what happens, to give advice and treatment," he told The Associated Press Cetojevic telephone interview. "He started to follow them. He started to sleep properly for the first time in their lives."
In fact, it seems as if it were that simple.
Djokovic had won only one Grand Slam title on the road in 2011. He now has four after winning the Australian Open, Wimbledon and US Open, while preparing for an incredible 64-3 record this year - with two of those losses from retirement of injuries, including a Davis Cup match Juan Martin del Potro of Argentina on Sunday.
Over the past two years, Djokovic was firmly entrenched as the No. 3 player in the world behind Roger Federer and Rafael Nadal. Although it has been constantly deepening in the majors, Djokovic only major came at the 2008 Australia Open. Otherwise, who lost the first game or drawing by because he had pretty good shape.
When things began to change, Djokovic fell to talking about his new training routine.
"I can not talk about it," Djokovic, who grew up in the pizza parlor of her parents at Mt. Kopaonik in southern Serbia, said the French Open, "because it's private."
Even if the gluten is not inherently bad to eat - can trigger reactions in people with celiac disease, estimated to number less than 1 percent of the population - to avoid it went mainstream. Coors Field offered a gluten-free rate of two years ago.
Cetojevic seen that Djokovic was gluten "to the stars" when he used a biofeedback machine to find out how food affects the body in Serbia.
The idea of working with Djokovic arrived two years ago, long before Cetojevic had never met the tennis star. And it started because of his wife, a holistic therapist in the United States.
"I saw Nole (Djokovic) played a match against (Jo-Wilfried) Tsonga in Australia," said Cetojevic. "My wife said, 'This guy has some allergies." He said, 'I do not think so. Another thing that is there. "
"She said," help. He is your countryman, "Cetojevic said with a laugh.
Cetojevic made a few calls from people who knew Djokovic and left a message, you may be able to help.
"Time passed and one day they called me," said Cetojevic, who traveled to Split, Croatia, to meet Djokovic for the first time he played in the Davis Cup quarter-final against Croatia in July 2010.
"I started to teach simple things like Nole and avoid talking on the phone and eat because you know your food," said Cetojevic, whose website says he trained at the Medical University of Sarajevo and also studied traditional Chinese medicine and magnetic therapy. "He started to respond very well. so begins to eat well, not weak stomach, vomiting after meals.
"Slowly, slowly, he began to build. I began to observe how it behaves."
After winning Wimbledon, Djokovic fired just after a blade of grass on the manicured lawns at the All England Club physically enjoy his victory, Cetojevic knew his work was over.
"I stopped after Wimbledon because it was our goal," says Cetojevic, who returned to practice in Cyprus. "We had our goals."
Deputy Director of UNICEF in Serbia Leslie Miller said that was honored as Djokovic became the National Ambassador of UNICEF.
