I got a question for you: The 2017 US Open was the 137th 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. Experimental rules featured in qualifying for the main draw as well as in the junior, wheelchair and exhibition events.

Based on this passage, where is the us tennis open being held this year?
Let's think first:
The relevant sentence in the passage is: It was held on outdoor hard courts at the USTA Billie Jean King National Tennis Center in New York City.
Therefore, the answer is the USTA Billie Jean King National Tennis Center in New York City.