Canadian tennis star and notable rival to Japan's own Kei Nishikori, Milos Raonic, has announced his tennis retirement. Although reasons for his decision were not detailed in the headline, retirements in professional sports are often due to injuries, age, or personal circumstances. Further details will likely be provided when the news is officially announced.

Tennis is highly popular in Japan, and Kei Nishikori is one of the country's most celebrated athletes. His rivalry with Raonic has been a prominent feature of their careers. Raonic's retirement would, therefore, generate significant interest and discussion among Japanese tennis fans and sports commentators.

Similar to Japan, tennis players' retirements are also big news in the US and EU. Players often become beloved public figures, and their retirements are met with tributes and retrospectives celebrating their career milestones and rivalries. It's customary for players to announce retirements at press conferences or through public statements, providing fans and the media insights into their decision.