Gerard scored a run of 87.sixteen to carry off Canadians Max Parrot and Mark McMorris, who completed second and third.
The 17-yr-previous Gerard, the youngest within the competitors, landed an ideal bottom triple cork 1440 on his remaining run and regardless of Parrot touchdown the identical trick on the ultimate run of the day the judges favoured the American.
Each boarder had three cracks on the course, with every athlete’s end result calculated as the most effective rating of the three as assessed by the 9 judges.
It was a disappointing day for Norway, who had three riders within the competitors. Sochi Video games silver medalist Staale Sandbech was fourth, with teenage sensation Marcus Kleveland a disappointing sixth.