The 2024 Jannik Sinner tennis season officially began on 14 January 2024, with the start of the Australian Open in Melbourne.

[2] The season saw Jannik Sinner clinch the world number 1 after winning his first Grand Slam title at the Australian Open.

[3] Sinner started his year at the Australian Open, where he beat Botic van de Zandschulp, Jesper de Jong, Sebastián Báez, Karen Khachanov and Andrey Rublev (all in straight sets) to reach his second Grand Slam semifinal and first at the Australian Open.

As the top seed at the Rotterdam Open, he recorded his 200th win in the quarterfinals, after Milos Raonic retired with a hip injury with Sinner leading by a set, becoming the first player born in the 2000s to accomplish this feat.

[10][11][12] After defeating Tallon Griekspoor in the semifinal and Alex de Minaur in the final, Sinner rose to a new career high of No.

[13] Sinner also became the first male player since Lleyton Hewitt, in 2001, to win his debut event as Grand Slam champion.

[16] Prior to his semifinal defeat to Carlos Alcaraz, Sinner had won 36 of his past 38 matches, dating back to the 2023 China Open.

At the 2024 Miami Open, Sinner defeated Grigor Dimitrov in the final to win his second Master’s 1000 title; as a result, he climbed to a career high (and Italian record) ranking of No.

At the 2024 Halle Open, Sinner defeated Tallon Griekspoor, Fábián Marozsán, Jan-Lennard Struff, Zhang Zhizhen and Hubert Hurkacz to win his debut tournament as World No.

On 20 August, it was announced that Sinner received an anti-doping sanction and was stripped of his money and points from the Indian Wells tournament in March, due to testing positive for Clostebol, a banned anabolic steroid, but one that is legal and readily available over the counter in Italy.