2023: Major & top 100 debuts, Maiden Major & Masters & top 10 wins, top 50
Following his third Challenger win at the 2023 Murcia Open, [6] he reached a career-high ranking of No. 102 on 10 April 2023.
Ranked No. 105, he qualified for the ATP 500 2023 Barcelona Open and won his first round match against Jaume Munar.
Next he qualified for the 2023 Madrid Open for his first Masters of the season and only the second overall and won his first Masters 1000 match over fellow qualifier Benoit Paire. Next, he upset world No. 4 and third seed Casper Ruud in straight sets for his first career top-10 win, to reach the third round of a Masters for the first time. [7] As a result he made his debut into the top 100 at No. 99 in the rankings on 8 May 2023. [8]
He received a wildcard for the main draw at the Italian Open, [9] where he defeated Diego Schwartzman in the first round. [10]
On his Grand Slam debut he qualified for the 2023 French Open and recorded his first win against Daniel Elahi Galán. As a result, he reached a new career high ranking of No. 72 on 12 June 2023. He also made his debut at the 2023 Wimbledon Championships. [11]
In Umag, Arnaldi beat qualifier Jesper de Jong, qualifier Flavio Cobolli and top seed Jiří Lehečka to reach his first ATP semifinal, only losing to the eventual champion Alexei Popyrin in more than 3 hours of play. [12]
In Toronto, Arnaldi qualified and recorded his first ever Masters 1000 win on hard courts beating local wildcard Vasek Pospisil in the first round, then fell to World No. 3 Daniil Medvedev in the second. [13] As a result, he reached a new career-high ranking of No. 61 on 14 August 2023. He reached the top 50 at No. 47 on 11 September 2023, following a fourth round showing at the US Open with wins over Jason Kubler, Arthur Fils in five sets and an upset over 16th seed Cameron Norrie in the third round. [14]
At the start of his first Asian swing he qualified for the ATP 500 China Open and reached the second round defeating fellow qualifier JJ Wolf. At the 2023 Rolex Shanghai Masters he defeated Alexei Popyrin and upset 21st seed Jan-Lennard Struff to reach the third round. [15]
He won the 2023 Davis Cup with team Italy. [16]
2024: Major fourth round, First Masters semifinal, top 30
He recorded his first win at the 2024 Australian Open defeating wildcard Adam Walton. He reached the top 40 at No. 38 on 29 January 2024.
Ranked No. 43 at the 2024 Delray Beach Open he defeated Yoshihito Nishioka firing 21 aces and recording 50 winners. [17] [18] At the 2024 BNP Paribas Open he reached the second round defeating Luca Van Assche. At the 2024 Miami Open he reached the third round for the first time at this Masters and only for the third time at this level, defeating Arthur Fils and 17th seed Alexander Bublik. He defeated Denis Shapovalov to reach the fourth round of a Masters for the first time in his career. As a result he reached the top 35 in the rankings on 1 April 2024.
At the beginning of the clay season, at the 2024 Barcelona Open Banc Sabadell, he reached the quarterfinals with a defeat of Arthur Cazaux by retirement, and of two Argentines, eight seed Sebastian Baez and qualifier Marco Trungelliti.
In May, at the 2024 French Open he upset sixth seed Andrey Rublev to reach the fourth round for the first time at this Major. [19]
At the 2024 National Bank Open he reached the semifinals for the first time at a Masters level, having never get past the fourth round, defeating qualifier Mackenzie McDonald and upsetting 16th seed Karen Khachanov, previous year semifinalist Alejandro Davidovich Fokina by retirement and Kei Nishikori. As a result he reached to the top 30 in the singles rankings on 12 August 2024. [20] [21] He lost to Andrey Rublev in straight sets. [22]
Italy
