According to former coach of Novak Djokovic, two records in tennis will never be broken - Rafael Nadal's 14 Roland Garros and Djokovic's 400 weeks as number one on the ATP Tour.
Nikola Pilic knows tennis, and whether you know him or not, he's not one to say things just to say them out loud. There is generally a lot of pondering before he actually says something.
The former coach of Djokovic was pretty open with his belief about some tennis records being impossible to break. He's not the only one to think that, of course, because some things do look seemingly out of reach.
Whatever the final Grand Slam number of Djokovic ends up being will, in many people's minds, be unreachable. According to Pilic, the Serbian already has a record that is unreachable, and it's the 400 weeks as number one.
On top of that one, the coach also thinks Nadal's 14 Roland Garros titles seem impossible to match, and he'd find very few people willing to argue against that.
I keep saying that there are two records that, in my understanding of tennis, are unattainable, those are Nadal's 14 titles at Roland Garros and Novak's 400 weeks in first place, which will be 410 until the Australian Open. I have been watching tennis for 65 years and these are all-time records.
Some might say that no record is unbreakable, and they would be correct. The problem arises when a record requires such a level that we haven't seen before. 20 Grand Slams seemed impossible before the Big Three did it, and 25 will be the same.
If Djokovic gets to 30, it will be the same because we never actually saw somebody play so well that it seems like a totally reasonable expectation. Every record pushes the sport forward, though, so nothing is truly impossible.