Marián Vajda
Marián Vajda is a Slovak tennis professional coach and former player. He is the current head coach of Novak Djokovic and was his coach during almost his entire professional career, winning 77 titles together.
He is the most successful coach in the history of tennis in terms of Grand Slam titles, winning 17 Grand Slam trophies with Novak Djokovic.
Career
Vajda was born in Považská Bystrica. He was a member of the Olympic Team of Czechoslovakia, and in 1992 he competed in the Olympic Games of Barcelona, being eliminated in the first round by Gilad Bloom 7–6, 6–1, 6–0. He reached the third round of the 1991 French Open, won 2 singles titles and achieved a career-high singles ranking of World No. 34 in September 1987.Vajda is a former captain of the Slovakia Davis Cup and Fed Cup teams. Vajda was the coach of Novak Djokovic from 2006 until 2017, then again from 2018 to the present day. From December 2013 until 2016, Boris Becker was Djokovic's new head coach with Vajda remaining part of Djokovic's team. For his great success with the Serbian tennis player, Vajda won the award for best coach by the Olympic Committee of Serbia in both 2010 and 2011. In 2018, Vajda won the ATP Coach of the Year award.
Career finals
Singles (2 titles, 2 runners-up)
| Outcome | W–L | Date | Tournament | Surface | Opponent in final | Score in final |
| Loss | 0–1 | 1987 Bavarian Tennis Championships – Singles| | Munich, West Germany | Clay |  Guillermo Pérez Roldán | 3–6, 6–7 |
| Win | 1–1 | Prague, Czechoslovakia | Clay |  Tomáš Šmíd | 6–1, 6–3 | |
| Win | 2–1 | 1988 Geneva Open – Singles| | Geneva, Switzerland | Clay |  Kent Carlsson | 6–4, 6–4 |
| Loss | 2–2 | Bari, Italy | Clay |  Juan Aguilera | 6–4, 3–6, 4–6 |