The correct answer is: Novak Djokovic.
Novak Djokovic won the 2016 US Open Men’s Singles title, defeating Stan Wawrinka in the final. Djokovic won in four sets, 6-2, 6-3, 6-4. This was Djokovic’s third US Open title, and his 13th Grand Slam title overall.
Rafael Nadal was the defending champion, but he lost in the quarterfinals to Juan MartÃn del Potro. Andy Murray was the second seed, but he lost in the third round to Sam Querrey. Stan Wawrinka was the third seed, and he reached the final before losing to Djokovic.
The 2016 US Open was the 138th edition of the tournament. It was held at the USTA Billie Jean King National Tennis Center in Flushing MeadowsâCorona Park, Queens, New York City, from August 29 to September 11, 2016.