Jessica Pegula reacts after defeating Ann Li in the fourth round of the U.S. Open tennis championships in New York AP

NEW YORK — 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.

The No. 4 seed rolled into the last eight by routing fellow American Ann Li 6-1, 6-2 in just 54 minutes on Sunday. She will face Barbora Krejcikova on Tuesday after the two-time Grand Slam champion fought off eight match points in a second set that ended with a 25-minute tiebreaker and beat Taylor Townsend 1-6, 7-6 (13), 6-3.

Townsend was trying to reach her first quarterfinal in her 31st Grand Slam appearance.

Pegula hasn’t dropped a set this year at Fl

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