1950 U.S. National Championships
{'<entity_0>': 'West Side Tennis Club', '<entity_1>': '1950 U.S. National Championships', '<entity_2>': 'US Open', '<entity_3>': 'tennis'}
[['1950 U.S. National Championships', 'instance of', 'US Open'], ['1950 U.S. National Championships', 'sport', 'tennis'], ['1950 U.S. National Championships', 'location', 'West Side Tennis Club']]
The <entity_1> (now known as the <entity_2>) was a <entity_3> tournament that took place on the outdoor grass courts at the <entity_0> in New York City, United States. It was the 70th staging of the <entity_2>, and the fourth Grand Slam <entity_3> event of the year.
['US Open', 'tennis tournament edition']