The former top-10 player uploaded a video of him practising yesterday and was set to fly to New York until he received the news on Sunday.
More bad news for fans of the injury-stricken player.
There is bad news for fans of the Japanese tennis star.
Asia’s highest ranked male tennis player is contemplating when he should return to the tour following surgery.
Max Mirnyi will join Kei Nishikori's team for the 2020 season.
Roger Federer's Olympic dream has had a seal of approval by the ITF today after questions over his participation
The world No.9 has made a significant change to his team.
Kei Nishikori will miss his home tournament in Tokyo later this month after failing to recover from an elbow injury in time.
The top 10 player admits that he had concerns coming into this year's tournament.
The world No.7 spoke about Federer and co following his first round win in New York.
Another grand slam, another chance for players to try and weaken the stronghold of Federer and co.
Hubert Hurkacz upset Kei Nishikori setting up a fourth round match against Denis Shapovalov at the BNP Paribas Open in Indian Wells. Polish rising star Hubert...
Kei Nishikori survived a big test from Adrian Mannarino to reach the third round in Indian Wells.
The duo reflects on their previous setbacks on the tour ahead of the ATP 500 tournament.
Novak Djokovic is into the semi-finals of the Australian Open after Kei Nishikori retired at 6-1 4-1 down to the Serb.
It was a marathon day for the two players in Melbourne Park as rain delayed proceedings.
It was a tough day at the office for Japan's top male player.
It was 10th time lucky for the Japanese No.1 in Australia.
Kei Nishikori has revealed that he felt scared during his wrist rehab as he aims for a grand slam title in 2019.
Dominic Thiem won his first match of the ATP Finals with a 6-1 6-4 win over Kei Nishikori in London.