Many would argue that he is the most talented male tennis player the world has ever seen.
But for all his brilliance, there is another side to Novak Djokovic – one which is capable of putting him in the headlines for all the wrong reasons.
He is there again at the moment, after he flew all the way to Australia only for officials to cancel his travel visa and declare he would be deported.
Djokovic had announced to fans on Tuesday that he had been given a medical exemption to travel to Melbourne and take part in the Australian Open later this month, even though he has not confirmed whether he has had the jab.
But after arriving at the airport, he was held for several hours as his documents were scrutinised over an apparent discrepancy.
On Thursday morning local time, it was announced he had been denied entry, with reports that the type of visa he had applied for does not support a medical exemption from the vaccination rule.
This is far from the only time he has hit the headlines for the wrong reasons, and here at Mirror Sport we've taken a look at some of the other controversial moments from his career.
Apparent anti-vaccine stance (Ongoing)
To this day, despite being asked the question regularly, Djokovic has still not revealed whether or not he has had the jab.
He cites medical privacy for his silence, repeatedly asserting that it is his right to reveal whether or not he has had any medical procedure.
But in the past he has voiced opposition to vaccines in general. In April 2020, he outright said he was opposed to vaccination and said he would not be forced to have one to play on the ATP Tour.
His reservations over a jab may stem from his desire to be "as natural as possible". After elbow surgery in 2018, he once said he cried for several days as he is "not a fan of surgeries and medications" and claimed the human body is a "self-healing mechanism".
Adria Tour (June 2020)
With the Covid-19 pandemic and measures put in place to help combat the spread of the virus still relatively new to the world, Djokovic decided to help organise and take part in the Adria Tour.
The competition – a series of exhibition matches and charity events – was later dubbed the 'Grand Slam of Covid' after images emerged of crowds not socially distanced and very few other apparent safety measures in place.
In the end the tour was abandoned, as Djokovic, his wife and several others all tested positive for the virus.
Djokovic later apologised and said he was wrong to put on the tournament, but then accused those who were criticising him of taking part in a "witch hunt".
Injuring a line judge at the US Open (September 2020)
As if he hadn't been in enough bother that summer, Djokovic ended up being booted out of the final Grand Slam of the year when he injured a line judge.
He reacted angrily to losing his serve during his fourth round match, and whacked a ball in frustration which ended up hitting the woman in the throat.
Djokovic and several others immediately rushed over to her aid, as she was pictured sat on the floor gasping for air.
Hitting the line judge had clearly been an accident and the Serbian made the point that she had not been seriously injured, but officials showed no mercy and it was soon announced that he had been disqualified.
Several racket-throwing tantrums (April/May 2019)
That incident in New York was not the first time he lost his temper after having his serve broken.
In April the year before, he was seen smashing a racket to pieces by repeatedly hitting it into the floor after seeing red at the Monte Carlo Masters.
In the same match, he threw another racket at the ball and it ended up sailing over the advertising hoardings and into the section of the stands where the ground staff sit, narrowly avoiding spectators.
Just a month later there were two more similar incidents at a competition in Rome.
First he screamed at an umpire and walked off the court in his second round match, and later in the tournament he launched his racket at an advertising board.
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