TENNIS icon Bjorn Borg has reportedly revealed he's been secretly battling cancer.

The five-time Wimbledon winner, according to reports in Sweden and Italy , has revealed his diagnosis in his soon-to-be-released autobiography, 'Heartbeat'.

The book is set to hit shelves worldwide on September 18, but has been made available earlier in Italy .

The type of cancer Borg has been battling has yet to be revealed.

And it's currently unclear whether or not the 69-year-old has recovered from his fight with the deadly disease.

Neither Borg nor any member of his family has commented on the revealing of his cancer diagnosis.

Borg is set to take part in a small press tour to promote his eagerly anticipated autobiography.

And it's widely expected that he'll field questions about his health

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