 He was a member of the winning Czech Davis Cup team in 1980, along with teammates Ivan Lendl, Tomáš Šmíd and Jan Kodeš.Složil served as Steffi Graf's coach from November 1986 until the end of 1991.Shortly after the start of his tenure as Graf's coach, she had her Grand Slam breakthrough year in 1987, winning six tournaments and then defeating Martina Navratilova in the French Open.