2020 In September, Guan made her senior debut at the
Chinese Championships representing the
Zhejiang provincial team. She led the team to win bronze in the team competition and individually qualified for the all-around final in second place behind reigning national champion
Liu Tingting with a score of 55.900. She also qualified in first place for the balance beam final by a wide margin over reigning
Junior World silver medalist
Wei Xiaoyuan and reigning
World silver medalist Liu. Her credited difficulty score of 7.0 was the highest of the 2017-2020 quad to that point. During the all-around final, she made multiple mistakes on the uneven bars, balance beam, and floor exercise and ended the competition in sixth place. During the balance beam final, she won the gold medal ahead of Wei and Liu with a score of 14.933, and she placed eighth in the floor exercise final.
2021 Guan began the season at the
Chinese Championships where she won a bronze medal with the Zhejiang team. Individually, she placed ninth in the all-around final and sixth in the balance beam final. In June, she competed at the 1st Chinese Olympic Trials and won the silver medal on the balance beam behind
Ou Yushan with a score of 15.133. Then at the 2nd Chinese Olympic Trials, she won the gold medal on the balance beam with a score of 15.366. She was then selected to represent
China at the 2020 Summer Olympics for one of China's two individual spots. At the
Olympic Games, Guan only competed on the balance beam during
qualifications and qualified first into the final with a score of 14.933. On August 3, Guan competed in the
balance beam final as the youngest competitor and won the gold medal with a total score of 14.633 ahead of teammate
Tang Xijing and American
Simone Biles. She became the third Chinese gymnast to win the Olympic gold medal on the balance beam after
Liu Xuan in 2000 and
Deng Linlin in 2012. After the Olympics, Guan competed at the
Chinese National Games but fell in the balance beam final and placed fifth with a score of 13.920.
2022 In October 2022, a representative of the Chinese Gymnastics Federation revealed that Guan had retired from gymnastics to focus on her studies at
Zhejiang University. == Competitive history ==