<Tr> <Td> ← 2017 </Td> <Td> US Open </Td> <Td> 2019 → </Td> </Tr> <P> Rafael Nadal was the defending champion, but retired in his semifinal match against Juan Martín del Potro . </P> <P> Novak Djokovic won the title, his third at the US Open and 14th Grand Slam title overall, tying Pete Sampras, defeating Juan Martín del Potro in the final, 6--3, 7--6, 6--3 . </P> <P> Nadal and Roger Federer were in contention for the ATP no . 1 singles ranking at the start of the tournament . Nadal retained the number 1 ranking after Federer lost in the fourth round . </P>

Who won the 2018 mens us open tennis