Jack Draper already questioning how long he will play for as Brit addresses 'sacrifices'

has admitted he doesn't know how long he will play professional tennis. The British No. 1 booked his spot in his first career Masters 1000 quarter-final on clay on Tuesday, needing

Draper took his career to the next level this year, winning Indian Wells and cracking the top 10. He's been open about the discipline and hard work that have made him one of the world's best players. While he "doubts" himself, the world No. 6 is happy to keep pushing for as long as he's on the tour.

The sacrifices that players make have become a talking point in recent days after Carlos Alcaraz's Netflix docuseries, My Way, premiered.

In it, the four-time Major winner tries to become one of the greats while maintaining the life of a normal 21-year-old, before winning Wimbledon.

Draper is only a couple of years older than Alcaraz, and he's now addressed how much tennis stars must give up to reach the top.

"There's no denying I think that in any professional sport, but especially in tennis it's so relentless, we're playing, we're competing, we're away from our families, we're just sacrificing our lives," the world No. 6 said on Wednesday.

"I think if you do this sport properly as well and give it everything every day, you know, it's tough. I doubt myself every day that, you know, can I keep going, can I keep going, can I keep going, but, you know, I do."

Although it can be difficult, Draper knows that his career won't last forever, and doesn't want to walk away from tennis with any regrets or missed opportunities.

The Brit continued: "So I guess if you want to be great, then these are the things you have to do. There's much harder work out there, you know, putting things in perspective.

"I do a sport I love, I get to travel with amazing people, earn good money. And, you know, it is really, really mentally challenging, physically challenging, but I think I kind of enjoy that.

"So I don't know how long I'll play for, I don't know if I'll play until I'm in the mid 30s, I don't know when I'll play to, so I'm just going to try and make the best out of my career, hopefully try and fulfill my potential. I know that in order to do that, then I need to give everything."

Draper is already making the most of his game in Madrid. The 23-year-old has little experience on clay, but he's now through to his biggest quarter-final on the surface.

The fifth seed needed just over an hour to breeze past Paul 6-2 6-2 on Thursday and he will now face Matteo Arnaldi, the unseeded Italian who stunned Novak Djokovic in round two.

"[He's a] young player, likes the clay. Obviously , that would have been big for his confidence," Draper said of his next opponent.

"I think he's been knocking on the door around top-30 for a while now. Really professional player. Like whenever I've seen him around he's always doing the right things. Fully dedicated to the sport."