Roger Federer, Rafel Nadal, or Novak Djokovic - who is the tennis Greatest of All Time?

Many believe the question will never be settled as it has always been subjective, even in other sports.

For German star Andrea Petkovic though, it is easy. One just needs to look at the numbers. Therefore, to her, it is Djokovic.

"I am a rational person, and there are the numbers," Petkovic told the Telegraf.

"If you look at them, not only has he won the most Grand Slams and Masters, not only has he spent the most weeks ranked as No. 1... I don't understand the discussion. If you ask the question, who has influenced tennis the most in 2,000 years, then it's OK. But that's not the question. The question is who is the greatest of all time, who is the GOAT, and that is Nole."

Djokovic currently has 23 Grand Slam titles, although he recently failed in his attempt for his 24th at Wimbledon Open. Roger Federer has 22, while Rafale Nadal has 20.

Djokovic can keep going with his psychological power

The 36-year-old tennis superstar just lost his attempt for a 24th Grand Slam at Wimbledon Open against Carlos Alcaraz.

Expect him to vie for more despite the loss, as, according to Petrovic, the Serbian is still in his top form. One can see that in his mindset.

"He is 36 years old, his colleagues can't do it anymore, but he still can," she said.

"Psychological power is natural, hard to imitate, so I see very high chances for him... Very low chances for others."