Kei Nishikori withdrew from the U.S. Open on Wednesday, saying a back injury has not fully healed. Nishikori was injured in May and pulled out of the French Open. The 2014 U.S. Open runner-up from Japan returned earlier this month for a first-round loss in Cincinnati but said his back isn't healthy enough to play in New York.
Original Source:
https://sports.yahoo.com/article/kei-nishikori-miss-us-open-174148953.html
