Naser powered home in 48.14 seconds, the third fastest time in history.
"I'm used to chasing,” said the 21-year-old. “When you watch my race normally I chase. Today I wanted to be chased and it worked."
The Nigeria-born sprinter, who won silver in the 400 metres final at the 2017 world championships, added: "I still can't believe the time. The time is so crazy, crossing the line and seeing the time I went completely crazy."
Naser hailed Miller-Uibo’s presence on the circuit for pushing her into better times.
"I think Shaunae is an amazing athlete," she added. "I love her energy and already said thank you to her because without her I don't think I would have gone so fast.”
Following the race Miller-Uibo sat on the track draped in a Bahamas flag mulling on what should have been.
"I let her get away too much on the kerb,” she confessed. “I can't compete with her with that sort of time.”