ANDY MURRAY has warned the next generation of tennis stars: Do not burn yourself out.
The Scot, 32, ran himself into the ground in 2016 and 2017 when he reached world No1 under workaholic coach Ivan Lendl.
After a long injury lay-off from hip resurfacing surgery, he returns to Grand Slam singles action at the 2020 Australian Open.
But there are new faces on the circuit now, with four of the top ten aged 23 or younger.
Murray is likely to face young guns Daniil Medvedev, Stefanos Tsitsipas, Alex Zverev and Matteo Berrettini at some stage of his comeback.
And he believes they have to manage their schedules better to avoid long-term issues.
He told CNN World Sport: The young players are all brilliant. When I came back this time its been quite difficult for me.
I dont know a lot of the players and I didnt watch lots of tennis when I was out injured.
Many of the guys Im competing against now Ive never played against and Ive not practised against because a lots changed in the two years since I got hurt.
If you look at the way Tsitsipas plays compared to Medvedev, compared to Zverev, theyre all very different.
It will be fun to get the chance to play against them next year.
Murray, now back up to world No125, admitted 2018 was a rough year but can only see positive signs in the New Year.
He joked: My 30s hadnt been particularly good! Its been up and down but I feel Im coming through the end of the bad bit and getting into some exciting times.
Can I win a Major again? I think Ill probably have a better idea after Australia in terms of how my body reacts to the best of five.
Ive not played a best of five-set match since the operation.
But I dont anticipate any issues with my hip because Ive played some long matches so far and its been fine.
Its the other bits of my body that hurt nowadays. Ill have to see how I hold up.
So far the signs are pretty good. Im sure I can win matches. Whether I can win a tournament or not I dont know.
Murray practised in Madrid yesterday as he began his Davis Cup preparations.
He is taking part in the team event for the first time in three years, four years after he guided Britain to a famous victory.
The cup, which started in 1900, has undergone a revamp and will now be a week-long event in the Spanish capital next week.
Wimbledon legend Boris Becker welcomed Murrays return as wonderful news for the sport.
The German, 51, said: I was really hoping he would find a way to fix his hip. Hes done that. Hes done the rehab. Hes done the tournaments.
The tennis world is very thankful for him to come back in great form. How far hes going to go who knows?