| 1 | Mariotti Federico | 2003 | Tennis Club New Country | 01'09''84 | 504 |  |  | |
50m 32.88 (32.88) 100m 1:09.84 (36.96) [1:09.84] |
| 2 | Terranova Daniele | 2003 | Roman Sport City SSD | 01'10''21 | 496 | | | |
50m 33.25 (33.25) 100m 1:10.21 (36.96) [1:10.21] |
| 3 | Piozzi Matteo | 2003 | I Swim Casetta Bianca SSD | 01'10''36 | 493 | | | |
50m 33.34 (33.34) 100m 1:10.36 (37.02) [1:10.36] |
| 4 | Sassi Pierferdinando | 2003 | Swim Project Venafro | 01'10''51 | 490 | | | |
50m 33.62 (33.62) 100m 1:10.51 (36.89) [1:10.51] |
| 5 | Ciuca Matei Alexandru | 2003 | Effedue Group | 01'10''71 | 486 | | | |
50m 33.52 (33.52) 100m 1:10.71 (37.19) [1:10.71] |
| 6 | Gregoletto Dario | 2003 | G. Sport Village SSD - Roma | 01'10''89 | 482 | | | |
50m 32.69 (32.69) 100m 1:10.89 (38.20) [1:10.89] |
| 7 | De Stefano Andrea | 2003 | Aurelia Nuoto ASD | 01'12''04 | 459 | | | |
50m 33.88 (33.88) 100m 1:12.04 (38.16) [1:12.04] |
| 8 | Pensabene Luca | 2003 | Aurelia Nuoto ASD | 01'12''54 | 450 | | | |
50m 33.92 (33.92) 100m 1:12.54 (38.62) [1:12.54] |
| | D'Andrea Giovanni | 2003 | Aquarea Water Project | 01'12''54 | 450 | | | |
50m 34.39 (34.39) 100m 1:12.54 (38.15) [1:12.54] |
| 10 | Nieddu Francesco | 2003 | Sistemi Integrati Sport ASD - Roma | 01'13''12 | 439 | | | |
50m 34.30 (34.30) 100m 1:13.12 (38.82) [1:13.12] |
| 11 | Zaza Gabriele | 2003 | Sport 2000 SSD - Roma | 01'13''22 | 438 | | | |
50m 35.07 (35.07) 100m 1:13.22 (38.15) [1:13.22] |
| 12 | Ciuca Theodor Mihail | 2003 | Effedue Group | 01'13''23 | 437 | | | |
50m 34.74 (34.74) 100m 1:13.23 (38.49) [1:13.23] |
| 13 | Raspante Lorenzo | 2003 | Rari Nantes Aprilia | 01'13''76 | 428 | | | |
50m 34.52 (34.52) 100m 1:13.76 (39.24) [1:13.76] |
| 14 | Scarascia Michele | 2003 | Olgiata 20.12 SSD | 01'13''79 | 428 | | | |
50m 34.63 (34.63) 100m 1:13.79 (39.16) [1:13.79] |
| 15 | Frasca Valerio | 2003 | Centro Sportivo Babel SSD | 01'14''59 | 414 | | | |
50m 35.44 (35.44) 100m 1:14.59 (39.15) [1:14.59] |
| 16 | Quintili Davide | 2003 | CS Onda Blu Torvajanica | 01'14''87 | 409 | | | |
50m 35.60 (35.60) 100m 1:14.87 (39.27) [1:14.87] |
| 17 | Fagiolini Alessandro | 2003 | Sistemi Integrati Sport ASD - Roma | 01'15''30 | 402 | | | |
50m 34.99 (34.99) 100m 1:15.30 (40.31) [1:15.30] |
| 18 | Carbone Carlo | 2003 | Larus Nuoto ASD - Roma | 01'16''64 | 382 | | | |
50m 34.95 (34.95) 100m 1:16.64 (41.69) [1:16.64] |
| | Illari Lorenzo | 2003 | Circolo Canottieri Aniene | Squalificato | |
| | Onorati Jacopo | 2003 | Castelli Romani ASD | Squalificato | |
| | Fantauzzi Luca | 2003 | Larus Nuoto ASD - Roma | Squalificato | |
