2022: ATP and Masters debuts, Maiden Challenger title

Arnaldi made his ATP main draw debut at the 2022 Rome Masters after receiving a wildcard into the singles and doubles main draws.^[3] He received these wildcards by winning the pre-qualification wildcard tournaments in both singles and doubles.^[4] He won his maiden Challenger title at the 2022 Internazionali di Tennis d'Abruzzo as a wildcard defeating Francesco Maestrelli.

Following Holger Rune's withdrawal to be first alternate at the 2022 ATP Finals, Arnaldi gained entry to participate in the 2022 Next Generation ATP Finals.^[5]

2023: Major & top 100 debuts, Maiden Major & Masters & top 10 wins, first ATP semi-final, top 50

Following his third Challenger win at the 2023 Murcia Open, 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.^[6] As a result he made his debut into the top 100 at No. 99 in the rankings on 8 May 2023.^[7]

He received a wildcard for the main draw at the Italian Open,^[8] where he defeated Diego Schwartzman in the first round.^[9]

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.^[10]

In Umag, Arnaldi beat qualifier Jesper de Jong, qualifier Flavio Cobolli and top seed Jiří Lehečka to reach his first ATP semi-final, only losing to the eventual champion Alexei Popyrin in more than three hours of play.^[11]

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.^[12] 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 a win over Arthur Fils in five sets and an upset over 16th seed Cameron Norrie in the third round.^[13]

At the start of his first Asian swing he qualified for the ATP 500 2023 China Open (tennis) 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.^[14]

Singles 10 (6–4)

Result	W–L	Date	Category	Tournament	Surface	Opponent	Score
Loss	0–1	Jul 2021	Futures	M25 Casinalbo, Italy	Clay	Franco Agamenone	4–6, 5–7
Win	1–1	Aug 2021	Futures	M25 Bolzano, Italy	Clay	Alexander Weis	6–0, 6–1
Loss	1–2	Sep 2021	Futures	M25 Eupen, Belgium	Clay	Facundo Diaz Acosta	6–7(6–8), 2–6
Win	2–2	Oct 2021	Futures	M25 Skopje, North Macedonia	Clay	Louis Wessels	6–1, 6–0
Win	3–2	May 2022	Challenger	Francavilla al Mare, Italy	Clay	Francesco Maestrelli	6–3, 6–7(7–9), 6–4
Loss	3–3	Aug 2022	Challenger	San Marino, Italy	Clay	Pavel Kotov	6–7(5–7), 4–6
Loss	3–4	Oct 2022	Challenger	Saint-Tropez, France	Hard	Mattia Bellucci	3–6, 3–6
Win	4–4	Feb 2023	Challenger	Tenerife, Spain	Hard	Raúl Brancaccio	6–1, 6–2
Win	5–4	Apr 2023	Challenger	Murcia, Spain	Clay	Borna Gojo	6–4, 7–6(7–4)
Win	6–4	Jun 2023	Challenger	Heilbronn, Spain	Clay	Facundo Diaz Acosta	7–6(7–4), 6–1

Doubles 2 (1–1)

Result	W–L	Date	Category	Tournament	Surface	Partner	Opponent	Score
Win	1–0	Sep 2019	Futures	M25 Pula, Italy	Clay	Jacopo Berrettini	Luciano Darderi Francesco Maestrelli	6–2, 6–2
Loss	1–1	Mar 2023	Challenger	Las Palmas, Spain	Clay	Luciano Darderi	Sadio Doumbia Fabien Reboul	7–5, 4–6, [7–10]