What does it take to be a successful tennis player? Get some tips that you can take into your next game.Coach: Cliff Drysdale, the voice of ESPN for 30 years.Bio: Cliff Drysdale has been ESPN’s voice of tennis for more than 30 years. President of the ATP from 1972-1974. Pioneer of the two-handed backhand, a stroke was rarely seen until he brought it to fruition in the 1960s. Ranked in the world Top 10 between 1965 and 1971, and rose to No. 4 in 1965. Played 49 Davis Cup matches for his native South Africa from 1962 to 1974, leading his country to the 1974 championship.Birthplace: South AfricaResidency: USALength: 1 min 42 secTheme: StrategyOther tracks by Cliff Drysdale: Stop Making Excuses, Key Moments, When Things Get Tough.