Jessica Pegula is back in the quarterfinals of a Grand Slam tournament, which used to be her roadblock. The way Pegula is playing at this U.S. Open , it may be just another stop on the way back to the final. Pegula rolled into the last eight by routing fellow American Ann Li 6-1, 6-2, in just 54 minutes on Sunday. The No. 4 seed hasn’t dropped a set this year at Flus

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