The Australian champion, ranked World No.21, needed one hour and 13 minutes to defeat his rival, World No.47.
"I felt good all week. I felt right at home," said Kyrgios, third seed, after his first win in Australia.
Thanking the spectators, he said: "Every time I stepped out here you gave me such great support. I love playing in front of you guys even though sometimes it may not seem that way. But I do. I really appreciate it."
Kyrgios overpowered Harrison in the same manner as in their previous two clashes -- Tokyo 2016 and Madrid 2017 -- without conceding any set.
Sunday's win was the fourth title in the 22-year-old Australian's short career, after three trophies in 2016 in Tokyo, Atlanta and Marseille.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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