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Age: 18 (August 16, 2001).
Despite his young age, Sinner has already lined up some notable achievements.
The Italian rising star won his first ATP Challenger title at Bergamo in February.
Sinner also made his first ATP Tour debut this year, winning on his first-ever match.
He had a fairly successful year at the top level, scoring one Masters 1000 win as a wild card at Rome.
After qualifying for the US Open main draw, Sinner scored his most impressive win of the year two months later.
The young Italian defeated top 10 player Gael Monfils on the way to the European Open semifinals.
Sinner made his ATP top 100 debut in November, but his year wasn’t over yet.
He received a wild card entry into the Next Gen ATP Finals and upset tournament favorite Alex de Minaur to win the title.
Age: 19 (August 8, 2000).
Auger-Aliassime had a successful career at the Junior level as a singles and doubles player.
He was the Boy’s Singles runner-up at Roland Garros and won his first Junior Slam title at the US Open in 2016.
He also reached three doubles finals, winning the 2015 US Open alongside fellow Canadian rising star Dennis Shapovalov.
Auger-Aliassime and Shapovalov also led Canada to the 2015 Junior Davis Cup title.
The Canadian qualified for his first ATP Challenger tournament as a 14-year old, setting a new record.
After piling up six titles on the Challenger Tour, he had a breakout year in 2019 on the ATP World Tour.
Auger-Aliassime reached three finals but failed to win a title.
The young Canadian made it to his first Masters 1000 semifinals at the Miami Open.
He then reached the third round at Wimbledon, his best career result at a major tournament.
After withdrawing from the Next Gen Finals, Auger-Aliassime and the young Team Canada impressed by finishing a runner-up to Spain at the Davis Cup.
Age: 20 (February 17, 1999).
De Minaur won one Junior Slam doubles title at his home Slam in 2016.
The Australian made his ATP World Tour debut the following year and advanced to the second round at the Australian Open.
In 2018, de Minaur won his first Challenger Tour title and also made it to his first final at the ATP World Tour level.
The young Australian’s 2019 season got off to a great start, as de Minaur won his first ATP title at his hometown, Sidney.
He added two more titles over the course of the year, while also finishing runner-up to Roger Federer at the ATP 500 Basel.
Despite entering the Next Gen Finals as the title favorite, de Minaur was upset by Jannik Sinner and finished as the runner-up.
His year came to a close following Australia’s elimination at the Davis Cup.
De Minaur impressed during the tournament, finishing with a 4-0 record while defeating top 15 players David Goffin and Denis Shapovalov.
Age: 20 (April 15, 1999).
Born into a tennis family, Shapovalov also had a successful Junior career.
He won the 2016 Wimbledon Boys Singles title and the 2015 US Open doubles title alongside Félix Auger-Aliassime.
The pair also led Canada to the 2015 Junior Davis Cup title.
After winning two ATP Challenger Tour titles, Shapovalov made his ATP World Tour debut in 2016.
His first victory came as an upset over Nick Kyrgios at Shapovalov’s home tournament, the Rogers Cup.
The Canadian’s breakout performance came a year later, again at the Roger’s Cup.
He defeated Rafael Nadal in a shocking second-round upset and became the youngest player ever to reach a Masters 1000 semifinals.
His year ended in style with a fourth-round berth at the US Open.
Shapovalov had a relatively quiet year in 2018 but went on to burst back into the scene this year.
He made it to the Miami Masters 1000 semifinals, defeating the top 10 ranked Stefanos Tsitsipas along the way.
The Canadian had an impressive final stretch.
Shapovalov won his first career ATP World Tour title in Stockholm in October.
He then defeated top 10 players Fabio Fognini, Gael Monfils and Alexander Zverev at Paris to reach his first Masters 1000 final, losing to Novak Djokovic.
Shapovalov, alongside his close friend Auger-Aliassime, helped lead a young Team Canada to a runner-up finish at the Davis Cup Finals.
He ended the year at a career-high number 15 in the ATP ranking.
Age: 21 (August 12, 1998).
Tsitsipas reached the top spot in the Junior ranking and won one Slam doubles title at Wimbledon in 2016.
The young Greek made his ATP World Tour debut in 2017, also qualifying for the main draw of a major tournament for the first time that same year.
Tsitsipas won his first Challenger title in 2017 as well.
Despite his young age, Tsitsipas quickly became the most successful player in Greece’s history.
He piled up wins over top 10 players over the course of 2018.
His highlight that year came at the Rogers Cup, as Tsitsipas beat three top 10 players in succession and finished runner-up to Rafael Nadal.
In October, the youngster made history by becoming the first Greek player to win an ATP World Tour title.
Tsitsipas won the Next Gen Finals to close out the year.
He reached the Australian Open semifinals in 2019, defeating Roger Federer in the quarters.
His meteoric rise continued, and Tsitsipas added two more titles on his way to a top 5 spot in the ATP ranking.
The Greek star then closed out his year in style.
After making it to the ATP Finals for the first time, Tsitsipas defeated Roger Federer in the semifinals and went on to win the tournament.
He enters 2020 red-hot and is definitely going to be one to keep an eye on.
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