Question: Who won the 2017 mens us open tennis?
Disambiguated questions and answers: question: Who won the 2017 mens singles us open tennis?
Who from the Netherlands won the 2017 mens doubles us open tennis?
Who from Romania won the 2017 mens doubles us open tennis?
Who won the 2017 mens champions invitational us open tennis?
answer: Rafael Nadal
Jean-Julien Rojer
Horia Tecău
John McEnroe
Patrick McEnroe
Natural Questions answer: Rafael Nadal (from the Wikipedia article "2017 US Open – Men's Singles")