He guessed that Djokovic’s breathing difficulties were the consequence of an imbalance in his digestive system which was triggering an accumulation of toxins in his intestines.
Cetojevic and Djokovic’s father had mutual friends and six months later the doctor was doing the bread test that confirmed his original suspicion.
His strength sapped, he won only four games in the last two sets as Tsonga coasted to victory.
The watching Cetojevic immediately suspected what was wrong.
Cetojevic told Djokovic that he suspected food sensitivities were causing his physical problems and affecting his mental state.
The key to the diet Djokovic now follows is the absence of both gluten – which is present in most foods – and dairy products. The world No 1’s diet is based on vegetables, beans, white meat, fish, fruit, nuts, seeds, chickpeas, lentils and healthy oils. Djokovic buys organic food wherever possible and cooks almost every meal himself; when on tour he always tries to stay in hotels which will let him use their kitchen. Novak Djokovic was in Croatia in the summer of 2010 for a Davis Cup tie and was having a consultation with Dr Igor Cetojevic, a nutritionist and fellow Serb.Cetojevic told Djokovic to stretch out his right arm while placing his left hand on his stomach.Djokovic’s early years as a professional were very different.In 2005 he had taken the first set against Guillermo Coria at the French Open but retired in the third because “my legs had turned to rock and I couldn’t breathe”.