#1 Ivan Lendl
Ivan Lendl is one of the few select group of individuals to have enjoyed a successful tennis career both as a player and as a coach. His powerful forehands topped with heavy topspin was the forereunner to today's slugfests that we see from the baseline. Lendl is the only male tennis player to have recorded a win percentage of 90% or over for 5 calendar years. Lendl won 8 Grand Slam titles in his career.
In 16 years, Lendl won 94 Singles titles -- the 3rd highest of all time behind only Roger Federer and Jimmy Connors..
Post-retirement, the reclusive Lendl took up coaching and most notably had two spells as the coach of Andy Murray. Before hiring Lendl, Murray had faced defeats in Grand Slams, falling at the last hurdle to the other members of the Big 4.
Lendl helped Murray win his first Grand Slam Major at the US Open of 2012 following his loss to Federer in the final of Wimbledon the same year.
In 2016, Lendl helped Murray attain the ATP World Number 1 ranking.
Before the start of the US Open 2018, Lendl took over as coach of Alexander Zverev and coached him to his maiden ATP Finals win in London.