| Men's 800m Prelim- Heat 1 | ||||||||||
| Pl | Name | Affiliation | Time | 200 | 300 | 400 | 500 | 600 | 700 | 800 |
| 1 | Nicholas Symmonds | Nike / Oregon TC Elite | 1:46.94 | 25.70 (25.70) | 38.86 (13.17) | 51.93 (13.07) | 1:05.85 (13.93) | 1:19.33 (13.48) | 1:33.09 (13.77) | 1:46.94 (13.85) |
| 2 | David Pachuta | Minnesota | 1:47.14 | 25.23 (25.23) | 38.45 (13.23) | 52.19 (13.74) | 1:05.79 (13.60) | 1:19.32 (13.54) | 1:32.92 (13.60) | 1:47.14 (14.23) |
| 3 | Erik Sowinski | Iowa | 1:47.30 | 25.14 (25.14) | 38.39 (13.25) | 52.12 (13.73) | 1:05.95 (13.84) | 1:20.05 (14.11) | 1:33.82 (13.77) | 1:47.30 (13.49) |
| 4 | Tevan Everett | New Jersey New York Track Club | 1:47.31 | 24.91 (24.91) | 38.02 (13.11) | 51.86 (13.85) | 1:05.73 (13.87) | 1:19.49 (13.77) | 1:33.24 (13.75) | 1:47.31 (14.07) |
| 5 | Sharif Webb | Unattached | 1:47.86 | 25.45 (25.45) | 38.63 (13.19) | 52.33 (13.71) | 1:06.11 (13.78) | 1:20.23 (14.13) | 1:34.12 (13.89) | 1:47.86 (13.75) |
| 6 | Rob Novak | N Y A C | 1:47.97 | 25.66 (25.66) | 39.00 (13.34) | 52.07 (13.08) | 1:06.08 (14.01) | 1:19.79 (13.72) | 1:33.75 (13.96) | 1:47.97 (14.22) |
| 7 | Lance Roller Jr | Virginia | 1:48.67 | 25.08 (25.08) | 38.21 (13.13) | 52.06 (13.86) | 1:06.22 (14.16) | 1:19.81 (13.60) | 1:34.04 (14.23) | 1:48.67 (14.63) |
| 8 | Willie Brown | Akron | 1:51.33 | 24.62 (24.62) | 37.86 (13.25) | 51.70 (13.85) | 1:05.62 (13.92) | 1:20.15 (14.53) | 1:35.30 (15.15) | 1:51.33 (16.04) |
| Men's 800m Prelim- Heat 2 | ||||||||||
| Pl | Name | Affiliation | Time | 200 | 300 | 400 | 500 | 600 | 700 | 800 |
| 1 | Tyler Mulder | Nike / Oregon TC Elite | 1:46.81 | 26.18 (26.18) | 39.77 (13.60) | 53.28 (13.52) | 1:07.05 (13.77) | 1:20.18 (13.14) | 1:33.42 (13.24) | 1:46.81 (13.40) |
| 2 | Ryan Martin | U C S B | 1:46.92 | 25.59 (25.59) | 38.76 (13.17) | 52.20 (13.45) | 1:05.48 (13.28) | 1:18.93 (13.46) | 1:33.15 (14.23) | 1:46.92 (13.77) |
| 3 | Mark Wieczorek | Unattached | 1:47.05 | 26.39 (26.39) | 40.02 (13.64) | 53.52 (13.51) | 1:07.28 (13.76) | 1:20.69 (13.42) | 1:33.86 (13.17) | 1:47.05 (13.19) |
| 4 | Brian Gagnon | New Jersey New York Track Club | 1:47.10 | 25.87 (25.87) | 39.31 (13.44) | 52.74 (13.44) | 1:06.26 (13.52) | 1:19.74 (13.49) | 1:33.27 (13.53) | 1:47.10 (13.83) |
| 5 | Brandon Johnson | Unattached | 1:48.82 | 25.95 (25.95) | 39.45 (13.51) | 52.93 (13.49) | 1:06.68 (13.75) | 1:20.50 (13.83) | 1:34.19 (13.69) | 1:48.82 (14.63) |
| 6 | Christian Smith | Unattached | 1:49.21 | 26.03 (26.03) | 39.55 (13.53) | 53.04 (13.49) | 1:06.85 (13.82) | 1:20.73 (13.88) | 1:34.60 (13.88) | 1:49.21 (14.61) |
| 7 | Benjamin Scheetz | Unattached | 1:49.42 | 26.07 (26.07) | 39.67 (13.60) | 53.20 (13.53) | 1:07.05 (13.85) | 1:20.92 (13.88) | 1:34.95 (14.03) | 1:49.42 (14.48) |
| 8 | Jackson Langat | Unattached | 1:49.47 | 25.77 (25.77) | 39.14 (13.37) | 52.53 (13.40) | 1:06.12 (13.59) | 1:19.99 (13.88) | 1:34.56 (14.57) | 1:49.47 (14.92) |
| Men's 800m Prelim- Heat 3 | ||||||||||
| Pl | Name | Affiliation | Time | 200 | 300 | 400 | 500 | 600 | 700 | 800 |
| 1 | Charles Jock | Nike | 1:47.90 | 25.68 (25.68) | 39.25 (13.58) | 52.99 (13.75) | 1:06.88 (13.89) | 1:20.60 (13.73) | 1:34.11 (13.51) | 1:47.90 (13.80) |
| 2 | Michael Rutt | N J N Y T C | 1:47.99 | 26.17 (26.17) | 39.67 (13.50) | 53.35 (13.69) | 1:07.42 (14.07) | 1:21.03 (13.61) | 1:34.55 (13.52) | 1:47.99 (13.45) |
| 3 | Michael Preble | Texas A&M | 1:48.20 | 25.94 (25.94) | 39.69 (13.76) | 53.21 (13.53) | 1:07.19 (13.98) | 1:20.83 (13.65) | 1:34.36 (13.53) | 1:48.20 (13.85) |
| 4 | Richard Jones | Santa Monica T C | 1:48.29 | 26.79 (26.79) | 40.32 (13.54) | 53.82 (13.50) | 1:07.63 (13.82) | 1:21.30 (13.68) | 1:34.70 (13.40) | 1:48.29 (13.60) |
| 5 | Tetlo Emmen | Unattached | 1:48.46 | 26.03 (26.03) | 39.91 (13.88) | 53.53 (13.63) | 1:07.22 (13.69) | 1:20.58 (13.36) | 1:34.20 (13.63) | 1:48.46 (14.26) |
| 6 | Liam Boylan-Pett | N J N Y T C | 1:48.46 | 26.33 (26.33) | 39.85 (13.52) | 53.41 (13.57) | 1:07.47 (14.06) | 1:21.27 (13.81) | 1:34.55 (13.28) | 1:48.46 (13.92) |
| 7 | Casimir Loxsom | Penn State | 1:49.25 | 25.75 (25.75) | 39.45 (13.70) | 53.12 (13.68) | 1:07.01 (13.89) | 1:20.72 (13.72) | 1:34.32 (13.60) | 1:49.25 (14.93) |
| 8 | Christian Gonzalez | N J N Y T C | 1:49.32 | 26.31 (26.31) | 40.08 (13.77) | 53.59 (13.52) | 1:07.79 (14.20) | 1:21.53 (13.74) | 1:35.25 (13.73) | 1:49.32 (14.08) |
| Men's 800m Prelim- Heat 4 | ||||||||||
| Pl | Name | Affiliation | Time | 200 | 300 | 400 | 500 | 600 | 700 | 800 |
| 1 | Khadevis Robinson | Nike | 1:47.30 | 25.35 (25.35) | 38.89 (13.54) | 52.66 (13.77) | 1:06.60 (13.95) | 1:19.97 (13.38) | 1:33.60 (13.63) | 1:47.30 (13.71) |
| 2 | Elijah Greer | Oregon | 1:47.42 | 25.69 (25.69) | 39.44 (13.75) | 52.70 (13.27) | 1:06.72 (14.02) | 1:20.20 (13.48) | 1:33.78 (13.59) | 1:47.42 (13.65) |
| 3 | Duane Solomon Jr | Saucony | 1:47.91 | 25.20 (25.20) | 38.77 (13.57) | 52.67 (13.91) | 1:06.38 (13.71) | 1:20.06 (13.69) | 1:33.86 (13.80) | 1:47.91 (14.05) |
| 4 | Joe Abbott | Unattached | 1:48.16 | 25.02 (25.02) | 39.04 (14.02) | 52.86 (13.83) | 1:06.77 (13.91) | 1:20.45 (13.69) | 1:34.35 (13.90) | 1:48.16 (13.81) |
| 5 | Harun Abda | Minnesota | 1:48.26 | 25.11 (25.11) | 38.89 (13.78) | 52.61 (13.73) | 1:06.49 (13.88) | 1:20.27 (13.79) | 1:34.08 (13.81) | 1:48.26 (14.19) |
| 6 | Andrew Dawson | Unattached | 1:48.35 | 25.23 (25.23) | 38.93 (13.70) | 52.62 (13.70) | 1:06.40 (13.78) | 1:20.42 (14.03) | 1:34.11 (13.69) | 1:48.35 (14.25) |
| 7 | Brandon Shaw | Brooks / Evo | 1:48.89 | 25.51 (25.51) | 39.17 (13.66) | 52.83 (13.67) | 1:06.58 (13.75) | 1:20.54 (13.97) | 1:34.38 (13.84) | 1:48.89 (14.52) |
| 8 | Patrick Roach | S.W.I.F.T. Racin | 1:50.11 | 25.48 (25.48) | 39.27 (13.79) | 53.04 (13.78) | 1:06.86 (13.82) | 1:20.87 (14.02) | 1:34.97 (14.10) | 1:50.11 (15.14) |