Thompson stuns top seed Isner in New York

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Jordan Thompson shocked New York Open No.1 seed John Isner, while defending champion Reilly Opelka progressed to the quarter-finals.

Thompson overcame big-serving American Isner, who had a first-round bye, 7-6 (7-2) 6-7 (3-7) 6-3 in New York on Friday (AEDT).

Isner was playing his first match since being forced to retire from his third-round clash against Stan Wawrinka at the Australian Open because of a foot injury.

Thompson lost to Isner in last year's New York quarter-finals but the Australian turned the tables after two hours, 31 minutes.

"I'm pretty stoked about that. That was a tough match," Thompson said. "I didn't get too many looks at Isner's serve, but managed to get the one break and held onto it."

Standing in the way of Thompson and the semi-finals is Andreas Seppi.

Opelka opened his title defence by cruising past Yoshihito Nishioka 6-4 6-4 at the ATP 250 tournament.

Next up is qualifier Jason Jung, who stunned No.7 seed Cameron Norrie 6-4 6-4, Kyle Edmund, the No.8 seed, was too good for German Dominik Koepfer 6-2 6-4.

At the Argentina Open in Buenos Aires, Diego Schwartzman and Guido Pella moved through to the quarters on clay.

Schwartzman, the No.1 seed, prevailed 6-3 4-6 6-2 over Federico Delbonis and second seed Guido Pella survived a marathon against Facundo Bagnis 7-6 (7-2) 6-7 (2-7) 6-4.

Fellow seeds Laslo Djere and Albert Ramos-Vinolas, however, crashed out after defeats to Juan Ignacio Londero and Pablo Cuevas.