Kellie Harrington's brain matched her brawn as she struck gold for Ireland at Tokyo 2020, with RTÉ analysts Eric Donovan and Kenny Egan praising the gold medallist's boxing IQ in the aftermath of her convincing victory.

Harrington fought her way to lightweight glory after a unanimous decision victory over Brazil's Beatriz Ferreira in a hard-fought final at the Kokugikan Arena.

"What a display," a delighted Donovan said after the win.

"I'm so happy and so, so proud of her.

"Ferreira had a brilliant start. Kellie lost the first round 3-2 on the judges scorecards, but found her range and remained disciplined.

"She didn't lose her head, didn't lose her focus, she stuck to her strengths and finally she found her measure, her distance and her target. And she found them at will.

"It was absolutely fantastic counterpunching and sharpshooting. Ferreira didn't know what to do."

Egan was equally impressed, praising the 31-year-old's versatility in alternating between orthodox and southpaw stances.

"Kellie put on a masterclass this morning," her fellow Olympian opined.

"After the first round, she upped the gears.

"I wanted her to stay in southpaw because she had great success in that stance, but her ability to switch stances and score any way she wants is fantastic."