Ivan Lendl is a former world no.1 professional tennis player. Originally from Czechoslovakia, he became a United States citizen in 1992. He was one of the game's most dominant players in the 1980s and remained a top competitor into the early 1990s. He has been described as one of the greatest tennis players of all time. Lendl's game relied particularly on strength and heavy topspin from the baseline and helped usher in the modern era of "power tennis".