context: Roger Federer (, August 8, 1981 ~) is a professional tennis player from Switzerland. From 2004 to 2008, the company ranked first in the world rankings for the first time in 237 consecutive weeks. He is regarded as the best player in history by many sports experts, critics and former and active players. [2] [3] [4] [5] [6]
question: Where is Roger Federer's nationality?
answers.text: Switzerland