The world's number one men's wheelchair tennis player, Kunieda Shingo, has decided to retire. He accomplished many achievements, including a Career Golden Slam of all four majors and the Paralympics.

Sources familiar with the matter say Kunieda has informed the International Tennis Federation that he is retiring as of Sunday.

The 38-year-old Japanese player competed in five consecutive Paralympics, starting with the 2004 Athens Games, winning the singles gold medal in three of them, including the Tokyo Games in 2021.

In 2022, he clinched his first Wimbledon singles title to complete his Career Golden Slam. Overall, he won a record 28 Grand Slam singles titles in his career.

Sources say he decided to retire at the beginning of this month, after finding it difficult to keep motivated.

Kunieda is expected to hold a news conference next month to explain the decision.