Novak Djokovic was born on May 22, 1987, in Belgrade, Serbia, the oldest of three sons of Srđan and Dijana Djokovic. He grew up in Kopaonik, a ski resort where his parents ran a pizza and pancake restaurant, and began playing tennis at age four. His talent was recognized at six by coach Jelena Genčić, who compared him to the young Monica Seles and began training him seriously. His family made enormous financial sacrifices to support his development, and he moved to the German tennis academy of Nikola Pilić at thirteen. He turned professional in 2003 and made his Grand Slam debut at the Australian Open in 2005.
Djokovic's early career was marked by three things: unmistakable talent, a reputation for retirement under pressure, and the shadow of Roger Federer and Rafael Nadal, who had divided the tennis world between them. His breakthrough season of 2007 — reaching his first Grand Slam final at the US Open and achieving world number three — announced his arrival among the elite. His complete remaking of his game and his body between 2010 and 2011, which included the adoption of a gluten-free diet after diagnosis of celiac disease and a mental approach reorganized around the work of mental performance coach Pepe Imaz, produced the most dominant single season in tennis history: 2011, in which he won three Grand Slams and ten overall titles with a 70-6 record.
Djokovic has won 24 Grand Slam singles titles — the most in the history of tennis — and has spent more time at world number one than any other player in history. His playing style is defined by ISTJ characteristics: the relentless consistency, the defensive mastery that turns opponents' weapons against them, the physical preparation that leaves nothing to chance, and the methodical accumulation of experience and improvement rather than the inspired improvisation of his rivals. He has been the most reliable returner in tennis history, the most consistent baseliner, and the player who loses the fewest points he is supposed to win.
Djokovic's refusal to receive the COVID-19 vaccine and the consequent exclusion from multiple tournaments, including his deportation from Australia before the 2022 Australian Open — a tournament he had won nine times — was the most publicly controversial episode of his career and a clear expression of the ISTJ's characteristic quality: the principled adherence to a personal value in the face of enormous institutional pressure, regardless of the practical consequences. The decision cost him potentially several additional Grand Slam titles and generated enormous public criticism. He also faced scrutiny over his stance during the 2022 Wimbledon ban on Russian and Belarusian players, which he opposed publicly.
