Novak Djokovic suggests the ‘only regret’ Kei Nishikori might have about his career as he retires from tennis

Novak Djokovic has suggested that Kei Nishikori only regrets that he wasn't able to "stay healthier longer" during his fantastic career.

Nishikori just retired from tennis on home soil at the Japan Open, losing his opening match to Frances Tiafoe in ... [2346 chars]

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