Behind her, van Vleuten came in for silver after a successful attack in the final mile.
Following a one-year postponement, the Summer Games will begin on July 23.
Dutch racer Demi Vollering attacked up the road, forcing the peloton to painfully speed up as American riders worked to close the gap.
New York Times dubbed her the Serena Williams of squash.
Azizul, the 2017 world champion keirin rider, said it was only the right thing to do for Malaysia to go down this route in order to take the fight to established cycling nations like Britain, Germany, Australia and Holland.
Niek Kimmann of the Netherlands beat countryman van Gendt in all but one run, and American Connor Fields—also an Olympic champion—won two of the three runs.