Liu Yang won the men's gymnastics rings gold at the Olympics on Monday, with You Hao completing a one-two for China.
Eleftherios Petrounias, Greece's defending champion from the Rio Games, took the bronze.
Liu, 26, who took team bronze at Rio 2016, was securing China's first gymnastics title at the pandemic-delayed Tokyo Olympics.
A former world champion on rings, Liu claimed gold with a total of 15.500 points, .200 clear of You.
Petrounias took third on 15.200 after a solid performance, only marred by under-rotating on his dismount and landing heavily on his knees.