Jannik Sinner, the 18-year-old who is the youngest player in the Top 100, wins the Next Gen ATP Finals.

Jannik Sinner was ranked outside the Top 500 to start 2019. On Sunday, he won the Next Gen ATP Finals title.

Jannik Sinner becomes the first Italian to win the Next Gen ATP Finals in Milan.

At No. 95 in the ATP Rankings, Jannik Sinner is the lowest-ranked player to win the Next Gen ATP Finals.

Alex de Minaur leaves Milan with an 8-2 record after his second consecutive runner-up finish.

Jannik Sinner, who watched the 2018 Next Gen ATP Finals from the stands, triumphs in Milan.

Jannik Sinner looks for his second Top 20 win of the season against Alex de Minaur in the Next Gen ATP Finals championship match.

Jannik Sinner gives his coach, Riccardo Piatti, an incredible birthday present by reaching the championship match at the Next Gen ATP Finals.

Jannik Sinner wins 12 of the last 17 games to defeat Miomir Kecmanovic at the Next Gen ATP Finals.

Alex de Minaur improves to 8-1 at the Next Gen ATP Finals.

Alex de Minaur improves to 8-1 at the Next Gen ATP Finals after reaching the championship match for the second straight year.

Frances Tiafoe looks for revenge against Alex de Minaur in their semi-final clash at the Next Gen ATP Finals.

Miomir Kecmanovic has jumped more than 70 spots in the ATP Rankings this year.

Alex de Minaur looks to reach the championship match at the Next Gen ATP Finals for the second consecutive year.

Ugo Humbert scores his maiden victory at the Next Gen ATP Finals against Jannik Sinner.

Frances Tiafoe breaks Mikael Ymer three times to advance out of Group B at the Next Gen ATP Finals.

Miomir Kecmanovic didn't face a break point in his win on Thursday against Alejandro Davidovich Fokina.

Alex de Minaur moves to 6-0 in round-robin play in his two appearances at the Next Gen ATP Finals.

Alejandro Davidovich Fokina is fired up to end his season on a high at the Next Gen ATP Finals.

Jannik Sinner's 56-minute win over Mikael Ymer is the second-fastest in tournament history.

Jannik Sinner records the most dominant scoreline in tournament history with his win over Mikael Ymer.

Frances Tiafoe keeps himself in contention to advance out of Group B with a win over Ugo Humbert.

Miomir Kecmanovic looks to advance out of Group A at the Next Gen ATP Finals.

Alex de Minaur moves to 2-0 in Group A on Wednesday at the Next Gen ATP Finals in Milan.

Alex de Minaur takes the lead in Group A after his win on Wednesday over Miomir Kecmanovic.