In which city is the US Open tennis tournament held every year?

On which type of surface is the US Open currently played?

Who was the first man to win the US Open in the Open Era (1968)?

Which tennis player is often called “The King of Clay” but has also won the US Open?

What is the name of the main stadium where US Open finals are played?

Who was the first Indian woman to win a Grand Slam title at the US Open?

What color are the tennis balls used at the US Open?

Which American sisters are famous for their multiple US Open victories?

The US Open is one of the four major tennis tournaments. What are these four tournaments called together?

In doubles matches at the US Open, how many players are on the court in total?