BREAKING: Tennis legend Bjorn Borg details secret cancer diagnosis in new tell-all autobiography

Tennis star Bjorn Borg writes about being diagnosed with cancer in his upcoming autobiography, according to reports in Sweden and Italy.

"Heartbeat", which will be released on September 18, details the Swede's secret battle with the disease, which he has kept hidden from the public.

The book, written together with his wife Patricia, will be released in the USA, UK, Australia, New Zealand, Spain, Latin America, the Netherlands and Italy, in addition to Sweden.

READ MORE: Iga Swiatek snaps at reporter in angry exchange after surprise US Open defeat

READ MORE: Carlos Alcaraz's reaction to controversial US Open question says it all

There will be more to follow on this breaking news story and Mirror Sport will bring you the very latest updates, pictures and video as soon as possible.

Please check back regularly for updates on this developing story.

Follow us on Google News, Flipboard, Apple News, Twitter, Facebook or visit The Mirror homepage.