Former US Open finalist Kei Nishikori to retire from tennis at the end of this year https://apnews.com/article/kei-nishikori-retirement-japan-f3d45e417bcb40b1f653eb3ee1563cad?taid=69f4ce0a16d5440001699f59&utm_campaign=TrueAnthem&utm_medium=AP&utm_source=Voante
