Alexander Zverev is warned not to expect instant success at the Grand Slam events from former British No. 1 Tim Schneman.
World No. 7 Zverev defeated top seed Rafael Nadal 6-2 in his opening match in the ATP final this evening.
The defending champion was expected to face a tough fight to get out of the group, but he already has one leg in the semifinals.
One criticism of the 22-year-old in the last few years is his failure to play in the biggest tournaments.
But Schneman believes Zverev should only take his time as Novak okokovic and Andy Murray in front of him.
"I see a few of them and the reality is Federer, Nadal and Okokovic will not be around forever," Scheeman told Amazon Prime Minister.
"I think Okokovic and Nadal will be around for a couple of years still.
"These guys have to be patient, but whether it's Zverev, [Stefanos] Ficipas, [Dominic] Thiem … I think they play great tennis and improve and they will win a specialty in four or five years.
"When you think about it, it wasn't the same for Federer and Nadal, but Okokovic and Murray had to take their time.
"They knocked on the door and three or four of the world for a while before they won the majors.
"But then they achieved their success and that's what was impressive. Let's win three [Grand Slams] it's incredible in this generation.
"For those of this next generation they have to be patient.
"But they need to continue to work hard, improve their games and keep improving."
Zverev will take on Stefanos Tzipipas in his second robin match on Wednesday, after the Greek impressed Daniel Medvedev earlier in the day.
Nadal must beat Medvedev also for two days to keep his girlfriend hopes for the ATP final.
The Spaniard is also battling with Novak Okokovic for the world number 1 year-end, but he will probably need to lift the trophy in London on Sunday to secure that honor.