<Table> <Tr> <Td> ← 2017 </Td> <Td> US Open </Td> <Td> 2019 → </Td> </Tr> </Table> <Tr> <Td> ← 2017 </Td> <Td> US Open </Td> <Td> 2019 → </Td> </Tr> <P> The 2018 US Open was the 138th edition of tennis' US Open and the fourth and final Grand Slam event of the year . It was held on outdoor hard courts at the USTA Billie Jean King National Tennis Center in New York City . </P> <P> Rafael Nadal and Sloane Stephens were the defending champions in the men's and women's singles events, however both failed to defend their titles . Nadal retired during his semifinal match against Juan Martín del Potro . Stephens was defeated in the quarterfinals by Anastasija Sevastova, whom Stephens had beaten at the same stage the previous year . </P>

Where is the tennis us open being held this year