| 19‑Mar‑2025 | Miami | Hard | R64 | 35 | 21 | (20)Tomas Machac [CZE] d. Arnaldi | 6-2 1-6 6-3 | | 0.90 | 8.1% | 4.1% | 60.8% | 64.4% | 51.7% | 2/5 | 1:44 |
| 3‑Feb‑2025 | Dallas | Hard | R16 | 39 | 59 | (8)Arnaldi d. Alejandro Davidovich Fokina [ESP] | 6-1 6-3 | | 1.63 | 4.0% | 0.0% | 62.0% | 80.6% | 52.6% | 2/2 | 1:07 |
| 26‑Aug‑2024 | US Open | Hard | R128 | 30 | 102 | (30)Arnaldi d. (WC)Zachary Svajda [USA] | 6-3 6-2 6-1 | | 1.43 | 13.5% | 6.7% | 55.1% | 83.7% | 40.0% | 8/9 | 1:44 |
| 17‑Jun‑2024 | Queen's Club | Grass | R32 | 35 | 16 | Arnaldi d. (8)Ugo Humbert [FRA] | 3-6 6-1 7-6(6) | | 1.01 | 10.0% | 6.7% | 54.4% | 75.5% | 61.0% | 4/5 | 2:08 |
| 27‑May‑2024 | Roland Garros | Clay | R64 | 35 | 90 | Arnaldi d. (WC)Alexandre Muller [FRA] | 6-4 6-1 6-3 | | 1.29 | 9.2% | 2.5% | 54.6% | 69.2% | 42.6% | 18/21 | |
| 22‑Apr‑2024 | Madrid Masters | Clay | R128 | 36 | 67 | Arnaldi d. Christopher Oconnell [AUS] | 6-4 6-1 | | 1.49 | 15.1% | 5.7% | 62.3% | 72.7% | 70.0% | 1/1 | 1:16 |
