Federer reaches US Open quarters, Barty knocked out

Qiang Wang, of China, reacts after defeating Ashleigh Barty, of Australia, during round four of the US Open tennis championships Sunday, Sept. 1, 2019, in New York. (AP Photo/Kevin Hagen)

Ashleigh Barty, of Australia, stretches for a return against Qiang Wang, of China, during round four of the US Open tennis championships Sunday, Sept. 1, 2019, in New York. (AP Photo/Kevin Hagen)

Roger Federer, of Switzerland, returns to David Goffin, of Belgium, during the fourth round of the US Open tennis championships Sunday, Sept. 1, 2019, in New York. (AP Photo/Sarah Stier)

NEW YORK — At his very best, Roger Federer can make even good players look lost on a tennis court.

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