Agnieszka and Urszula Radwanska
Radwanska introduced Agnieszka (pictured) and Urszula to tennis at age 4 and 5, respectively. Agnieszka, a top-10 player, had worked with him for most of her career before going in a different direction in January 2012. She hired her sister's coaches, Borna Bikic (who was Jelena Dokic's coach) and Tomasz Wiktorowski. Robert still works with his daughters when they're home in Poland, but does not travel with them.