| 1 | Carozzo Simone | 1998 | Rari Nantes Torino | 03'56''26 | 725 |  |  | |
50m 27.62 (27.62) 100m 57.15 (29.53) [57.15] 150m 1:27.08 (29.93) 200m 1:57.74 (30.66) [1:00.59] 250m 2:58.03 (1:00.29) 300m 3:56.26 (58.23) [1:58.52] |
| 2 | Bricchi Leonardo | 1999 | Nuoto Club Brebbia | 03'56''42 | 723 | | | |
50m 27.02 (27.02) 100m 56.90 (29.88) [56.90] 150m 1:27.34 (30.44) 200m 1:57.99 (30.65) [1:01.09] 250m 2:57.20 (59.21) 300m 3:56.42 (59.22) [1:58.43] |
| 3 | Marsic Umberto | 1998 | Team Insubrika - Creval | 04'04''20 | 656 | | | |
50m 27.47 (27.47) 100m 57.69 (30.22) [57.69] 150m 1:28.76 (31.07) 200m 2:00.36 (31.60) [1:02.67] 250m 3:03.65 (1:03.29) 300m 4:04.20 (1:00.55) [2:03.84] |
| 4 | Guala Matteo | 1999 | Andrea Doria | 04'04''50 | 654 | | | |
50m 28.23 (28.23) 100m 58.93 (30.70) [58.93] 150m 1:30.07 (31.14) 200m 2:01.50 (31.43) [1:02.57] 250m 3:03.26 (1:01.76) 300m 4:04.50 (1:01.24) [2:03.00] |
| 5 | Xella Alessandro | 1999 | Imolanuoto | 04'05''35 | 647 | | | |
50m 27.47 (27.47) 100m 57.88 (30.41) [57.88] 150m 1:29.21 (31.33) 200m 2:00.96 (31.75) [1:03.08] 250m 3:02.91 (1:01.95) 300m 4:05.35 (1:02.44) [2:04.39] |
| 6 | Lunghi Marco | 1998 | Nuotatori Milanesi | 04'06''85 | 635 | | | |
50m 28.98 (28.98) 100m 59.92 (30.94) [59.92] 150m 1:30.98 (31.06) 200m 2:02.48 (31.50) [1:02.56] 250m 3:04.99 (1:02.51) 300m 4:06.85 (1:01.86) [2:04.37] |
| 7 | Mantegazza Flavio | 1999 | Nuotatori Milanesi | 04'08''34 | 624 | | | |
50m 28.71 (28.71) 100m 59.73 (31.02) [59.73] 150m 1:31.83 (32.10) 200m 2:03.85 (32.02) [1:04.12] 250m 3:07.44 (1:03.59) 300m 4:08.34 (1:00.90) [2:04.49] |
| 8 | Angelillo Lorenzo | 1999 | Sisport SPA SSD | 04'09''67 | 614 | | | |
50m 28.34 (28.34) 100m 58.81 (30.47) [58.81] 150m 1:29.89 (31.08) 200m 2:01.45 (31.56) [1:02.64] 250m 3:05.55 (1:04.10) 300m 4:09.67 (1:04.12) [2:08.22] |
