Alexander Zverev hit the high point of his still-young career on Sunday, beating World No. 1 Novak Djokovic to raise his initial Nitto ATP Finals

However, Zverev has achieved a lot at his youthful age. He has already captured three ATP World Tour Experts 1000 names and earned 23 successes against opponents within the Top 10 of the ATP Rankings.

So one can wonder, where were a few of the best players in the sport when they were Zverev’s age? ATPWorldTour.com flashes back to take a look at where all of four active players who have reached No. 1 in the ATP Rankings were when they were 21 years, 212 days old.

Roger Federer
Considering Federer currently has 99 tour-level trophies, one may be amazed that he owned just six when he had been Zverev’s age.

The Swiss had climbed to No. 4 at the ATP Rankings, also won an impressive 178 tour-level matches. And Federer had won his first ATP World Tour Experts 1000 name 10 months before in Hamburg, beating against two competitions within the Top 10 en route to what was the triumph of his youthful career.

After he had been Zverev’s age that Federer broke out, Nevertheless, it was. Back in March of 2003, when Federer had been 21 years he had lifted two prizes that year. The next February, Federer ascended to the top of the ATP Rankings for the first of what’s been 310 weeks in World No. 1.

Rafael Nadal
The Spaniard attained an unbelievable quantity by the time he had been Zverev’s age. Nadal had already won 23 tour-level names, including his initial nine ATP World Tour Experts 1000 crowns and three Coupes des Mousquetaires in Roland Garros.

 Titles Pros 1000 Titles Career-High ATP Ranking Record Winning Percentage
23 9 Two 254-66 79.4%

Novak Djokovic
The Serbian, had recently captured his initial Nitto ATP Finals decoration when he was 21 years, 112 days old. This was Djokovic’s 11th name, and it came at the close of his very best season thus far.

In 2008, Djokovic claimed four victories, all of which were ‘Big Titles’. The Planet No. 1 won his first Grand Slam championship in the Australian Open that year, earned his third and fourth ATP World Tour Experts 1000 names in Indian Wells and Rome, also won at least 60 matches for the second consecutive year.

Djokovic spent the entirety of 2008 in No. 3 at the ATP Rankings, and he earned 11 victories against Top 10 opponents which year. And because Djokovic would win five names in 2009 there wasn’t any stopping from there, and the rest is now history.

 Titles Pros 1000 Titles Career-High ATP Ranking Record Winning Percentage
 11 4 3 185-68 73.1%

Andy Murray
The Scot had climbed to a career-best No. 4 at the ATP Rankings when he had been Zverev’s age. Murray won an impressive five ATP World Tour names in 2008, bringing his career total to eight in just 21 years old.

When the Spanish event took place later murray claimed that his first two ATP World Tour Experts 1000 names that year, triumphing at Madrid and Cincinnati. Murray also advanced to his maiden Grand Slam final in 2008, beating Nadal en route to the championship match in the US Open, where Federer will claim his fifth successive trophy.

And that year, while Murray fell short in that match, he won three of his four FedEx ATP Head2Head meetings against Federer, along with his win from Nadal in Flushing Meadows was his first victory from the Spaniard in six tries.

 Pros 1000 Titles Career-High ATP Ranking Winning Percentage8 Two4155-65 70.4%