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In November, Arnaldi was part of the Italy team which won the [[2023 Davis Cup|Davis Cup]], defeating Alexei Popyrin in the opening singles match of the final.[{{Cite web|url= https://www.reuters.com/sports/tennis/arnaldi-gives-italy-1-0-lead-over-australia-davis-cup-final-2023-11-26/|title= Arnaldi gives Italy 1-0 lead over Australia in Davis Cup final|website=Reuters}}][{{cite web|url=https://www.tntsports.co.uk/tennis/davis-cup/2023/david-cup-2023-italy-power-to-cup-glory-for-first-time-since-1976-as-matteo-arnaldi-and-jannik-sinne_sto9897773/story.shtml|title=David Cup 2023: Italy power to trophy for first time since 1976 as Matteo Arnaldi and Jannik Sinner emerge victorious|publisher=TNT Sports|accessdate=15 April 2026}}] |
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In November, Arnaldi was part of the Italy team which won the [[2023 Davis Cup|Davis Cup]], defeating Alexei Popyrin in the opening singles match of the final.[{{Cite web|url= https://www.reuters.com/sports/tennis/arnaldi-gives-italy-1-0-lead-over-australia-davis-cup-final-2023-11-26/|title= Arnaldi gives Italy 1-0 lead over Australia in Davis Cup final|website=Reuters}}][{{cite web|url=https://www.tntsports.co.uk/tennis/davis-cup/2023/david-cup-2023-italy-power-to-cup-glory-for-first-time-since-1976-as-matteo-arnaldi-and-jannik-sinne_sto9897773/story.shtml|title=David Cup 2023: Italy power to trophy for first time since 1976 as Matteo Arnaldi and Jannik Sinner emerge victorious|publisher=TNT Sports|accessdate=15 April 2026}}] |
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===2024: Major fourth round, first Masters semifinal, top-30=== |
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===2024: Major fourth round, first Masters semifinal, top 30=== |
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Arnaldi recorded his first win at the [[2024 Australian Open – Men's singles|Australian Open]] defeating wildcard entrant [[Adam Walton (tennis)|Adam Walton]],[{{cite web|url=https://www.tennismajors.com/australian-open-news/australian-open-italys-arnaldi-moves-into-second-round-on-melbourne-debut-736602.html|title=Australian Open: Italy’s Arnaldi moves into second round on Melbourne debut|publisher=Tennis Majors|accessdate=15 April 2026}}] before losing to 10th seed [[Alex de Minaur]] in the second round.[{{cite web|url=https://www.theguardian.com/sport/2024/jan/17/alex-de-minaur-australian-open-results-vs-matteo-arnaldi-third-round-draw|title=Alex de Minaur demolishes Matteo Arnaldi on way to Australian Open third round|publisher=The Guardian|accessdate=15 April 2026}}] |
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Arnaldi recorded his first win at the [[2024 Australian Open – Men's singles|Australian Open]] defeating wildcard entrant [[Adam Walton (tennis)|Adam Walton]],[{{cite web|url=https://www.tennismajors.com/australian-open-news/australian-open-italys-arnaldi-moves-into-second-round-on-melbourne-debut-736602.html|title=Australian Open: Italy’s Arnaldi moves into second round on Melbourne debut|publisher=Tennis Majors|accessdate=15 April 2026}}] before losing to 10th seed [[Alex de Minaur]] in the second round.[{{cite web|url=https://www.theguardian.com/sport/2024/jan/17/alex-de-minaur-australian-open-results-vs-matteo-arnaldi-third-round-draw|title=Alex de Minaur demolishes Matteo Arnaldi on way to Australian Open third round|publisher=The Guardian|accessdate=15 April 2026}}] |