Novak Djokovic had caused quite the stir due to his unvaccinated status ahead of the Australian Open earlier this year.
Serbia's prosecutor's office said there was no evidence suggesting the tests had been manipulated, according to an inquiry by the country's health ministry.
Rafael Nadal became the first male player to win 21 singles Grand Slams titles, eclipsing both Roger Federer and Novak Djokovic.
Rafael Nadal has won his 21st Grand Slam title and that has tilted the balance in the Greatness debate in the Spaniard's case.
His second Grand Slam trophy in Melbourne turns out to be the one that helps him to leapfrog two of his main competitors – Roger Federer and Novak Djokovic.
On Sunday, Rafael Nadal beat Daniil Medvedev in a five-set thriller 2-6, 6-7, 6-4, 6-4, 7-5 to win Grand Slam number 21.
Medvedev was all heart and legs to enter his second consecutive Australian Open final but finds Spanish ace Rafael Nadal on his way to glory.
In terms of Grand Slam trophies, the Serbian World No. 1 is tied with seasoned giants Roger Federer and Rafael Nadal.
Djokovic has held the No. 1 ranking for a record 338 weeks and has concluded the year as the ATP year-end No. 1 on six occasions.
Nick Kyrgios has often spoken out on the fact that tennis officials must do more to market and promote players beyond the 'Big 3'.