Lee Zii Jia declared he has showcased one of his best performance of his career to capture the Australian Open men's singles title after he overcame Kodai Naraoka in a gripping final on Sunday.

The world number eight was stretched to the wire, but exuded the calmness needed to secure the 21-19, 11-21, 21-18 victory after battling for 78-minutes in the Super 500 final.

"I didn't expect to the reach the final, let alone win the title this way. This is one of the best games of my career, and me and Kodai gave it all out. It was a truly exciting match," said Lee, who added his composure at the end of the deciding match paid off.

"Even when he started to chase me at 11-17 to match the scores, I didn't feel nervous at all. This is the feeling I want to have. Mentally I have changed a lot, I will know how to stay calm ahead of the Olympics."

After edging the first game, Naraoka battled back to dominate the second game, and he fought hard to chase Lee from 11-17 to 18-18.

But Lee stayed calm to convert the final three points to ensure his second title in a month.

He also won the Thailand Open title and reach the Malaysia Masters final last month.

Lee will head back to Malaysia to rest and recharge before he prepares to contend at his second Olympics in just over a month.

By winning in Sydney, Lee will move up the rankings and ensures he gets a better seeding at the Paris Olympics.