1. Duck Hee Lee (KOR) 15y 0m (2013)
2. Franco Davin (ARG) 15y 1m (1985)
3. Andre Agassi (USA) 15y 1m (1985)
4. Rafael Nadal (ESP) 15y 3m (2001)
WOW! In the company of two All-Time Great players and a world-renowned tennis coach/Davis Cup Captain. Frano Davin coached both Juan Martín Del Potro (2009 US Open) and Gastón Gaudio (2004 French Open) to Grand Slam titles. It's quite impressive for Duck Hee Lee to top this list.