The British number four produced a gritty display during his 6-4 6-2 3-6 6-3 victory against the home favourite.
Mmoh, ranked 89 in the world, hit back in the third, but Draper dug deep to break for 4-2 in the fourth before clinching a huge win.
Grandstand is also the court which Draper hurt his hamstring a year ago in his third-round match against Karen Khachanov, forcing him to retire. The 21-year-old has been beset by injuries ever since and was a doubt to even play in New York due to a tear in his shoulder. Yet Draper, serving with less vim than usual in a bid to manage the problem, still thumped 52 winners to surge into the last 16.He said: “It was a tough match, Michael is an incredible player who has had a great year and I knew would be a challenge. I was proud of the way I came through it.
“Last year was really difficult, I injured myself and didn’t want that to happen today. To come it through after a tough year for me, I’m very happy.”An out-of-sorts Norrie, the 16th seed, was beaten 6-3 6-4 6-3 by the Italian world number 61.
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