4. Boris Becker

In December 2013, Novak Djokovic sought the services of Boris Becker as his coach. Since Becker had no experience in coaching before, it was quite a challenge for him to help Djokovic surpass two of the greatest stars that the sport of tennis has had: Roger Federer and Rafael Nadal.

The Becker-Djokovic partnership worked like a charm. In just three years, Becker helped the player from Serbia win six Grand Slam titles along with 14 ATP Masters 1000 titles.

Djokovic and Becker decided to go their separate ways in 2016 and currently Becker is working as an analyst for BBC. He has also been in charge of the Head Coach of the German Tennis Federation since 2017.

5. Nick Bollettieri

Nick Bollettieri is one of the most widely respected and admired tennis coaches. He has guided a host of several successful tennis players. His book Tennis Handbook has been the go-to book for budding players and coaches around the world over the years. From tactics and strategy to mental conditioning, the book covers everything.

Bollettieri has coached many tennis players who have become World Number 1, including Monica Seles, Marcelo Rios, Jim Courier, and Andre Agassi. In addition, he played an important role in stars such as Serena and Venus Williams, Maria Sharapova, and Mary Pierce winning Grand Slam titles. Bollettieri was one of the five inductees to the International Tennis Hall of Fame in 2014.

6. Tony Roche

Part of the Big 5 of Australian tennis in the 1960s and 1970s, Tony Roche was a very skilled singles player, who won the 1966 French Open and won a total of 46 singles titles and 12 Grand Slam doubles titles during his career.

Roche became the coach of Ivan Lendl to help him hone his volleying skills. Their partnership was fairly productive, even though Lendl never won Wimbledon.

Roche then coached Pat Rafter and helped him become the world’s Number 1 player. He also worked with Roger Federer between 2005 and 2007 when Federer won 8 of his 20 Grand Slam titles.