Novak Djokovic's biographer claims the Serbian will now get his Covid-19 vaccination because he had to sit and watch Rafael Nadal win a record 21st Grand Slam at the Australian Open.
Djokovic was kicked out of Australia earlier this year before the tournament where he was defending champion began.
He arrived in the country to uproar after revealing he had a medical exemption to compete unvaccinated - which later emerged to be due to his claims he contracted the virus late last year.
He was in enforced hotel quarantine when Australia's border force cancelled his visa and he went to court trying to overturn their decision.
But it now appears that Nadal's victory, combined with other tournaments enforcing stricter rules regarding vaccination, could have changed his mind, according to Daily Mail.
His biographer Daniel Muksch appeared on Austrian TV channel ServusTV and said: "What you hear from his environment, I think he's getting vaccinated.
"Maybe the final in Melbourne also contributed to that. Rafael Nadal's 21 is driving him, no question."
Muksch's book on Djokovic, called 'A Lifetime At War', comes out in March.
Nadal defeated World No 2 Daniil Medvedev in a thrilling final on Sunday, fighting back from two sets down to win the final and overtake both Djokovic and Roger Federer on 21 titles. The other two are level on 20.
Djokovic took to social media to congratulate Nadal, saying: "Congratulations to @RafaelNadal for 21st GS.
"Amazing achievement. Always impressive fighting spirit that prevailed another time.
"@Medwed33 (Medvedev's social media handle) gave it his all out there and played with the passion and determination we have come to expect from him."