John Isner defeat Raonic and enters into US open quarter-final

John Isner ground out yet another three-hour-plus match at the U.S. Open on Sunday.

John Isner ground out yet another three-hour-plus match at the U.S. Open on Sunday, nailing critical break points to beat Canadian Milos Raonic a 3-6 6-3 6-4 3-6 6-2 and advance to the quarter-finals of his home Grand Slam for the second time.

The American fired 56 winners and 20 aces to down the former world number three in front of a rowdy and elated crowd of his compatriots inside the newly-built Louis Armstrong Stadium.

Isner endured a five-set bout in the second round of the tournament and a three hour and 26-minute blockbuster in the third, but the eleventh seed showed few signs of fatigue.

"This crowd kept me in it – it was fantastic," Isner said in an on-court interview after the three hour and eight-minute match. "This is why we tennis players train so hard ... to be in a match like this in front of a crowd like this."

Isner next meets either Croatian Borna Coric or third seed Juan Martin del Potro, who play their fourth-round match later on Sunday in Arthur Ashe Stadium.

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