Novak Djokovic's coach between 2006-2017 was Marian Vajda. Vajda was Djokovic's childhood friend and had been his coach since the early days of his career. Together, they achieved great success, including 12 Grand Slam titles, multiple ATP World Tour Masters 1000 titles, and numerous other accolades. In 2017, Djokovic and Vajda parted ways but later reunited in 2018, and have continued to work together to this day.