Explanation:

- Viktor Axelsen: He won the Men’s Singles title at the All England Open Badminton Championship in 2020. A Danish badminton player known for his powerful and skillful play, Axelsen claimed his first All England title by defeating Chou Tien-chen.

- Chou Tien-chen: A top-ranked player from Taiwan, Chou reached the finals in 2020 but was defeated by Viktor Axelsen, making Axelsen the champion.

- Lee Chong Wei: A retired Malaysian badminton star, he never won the All England title in 2020. He had announced his retirement from the sport in 2019.

- Lin Dan: A legendary Chinese player often considered one of the greatest of all time, he did not win the title in 2020 and was not in the finals.