Sport Other Sport Kei Nishikori says he will hang up his racquet at the end of the 2026 season, bringing down the curtain on a professional career that saw him break new ground for Japanese tennis. Nishikori, 36, became the first Japanese player to reach a Grand Slam singles final at the 2014 US Open and was the second Asian man after Thailand's Paradorn Srichaphan to make it into the top 10. He reached a career-high ranking of number four in 2015 and won 12 titles on the ATP Tour, but has been plagued by injuries for years and has fallen to 464 in the world rankings. The last time he was ranked in the top 10 was in October 2019 and last month admitted he was "barely hanging on" in terms of physical fitness. "Reaching the ATP Tour, playing at the highest level of competition and maintaining a presence in the top 10 is something I am extremely proud of," Nishikori wrote in a post on social media on Friday.  "Whether in victory or defeat, the special atmosphere I felt in packed arenas is irreplaceable ...…