The United States Open’s final round on Sunday was seen by an average of 6.7 million viewers on Fox. The audience peaked at 11.2 million from 10 to 10:30 p.m. Eastern. The Sunday viewership fell from a 9.6 million average the last time the Open was held in the Pacific time zone, in 2012, but last year’s Open in Pinehurst, N.C., had only a 4.6 million average.