# Swimming at the 2003 World Aquatics Championships – Men's 50 metre breaststroke

The Men's 50 Breaststroke event at the 10th FINA World Aquatics Championships swam July 22 – 23, 2003 in Barcelona, Spain. Preliminary and Semifinal heats were on 22 July, with Prelims swum in the morning session and Semifinals in the evening session. The Final swam in the evening session on 25 July.
At the start of the event, the existing World (WR) and Championship (CR) records were:
* WR: 27.18 swum by Oleg Lisogor (Ukraine) on August 2, 2002 in Berlin, Germany
* CR: 27.52 swum by Oleg Lisogor (Ukraine) on July 29, 2001 in Fukuoka, Japan

## Results
### Final

| Place | Swimmer | Nation | Time |
| 1 | James Gibson | Great Britain | 27.56 |
| 2 | Oleg Lisogor | Ukraine | 27.74 |
| 3 | Mihály Flaskay | Hungary | 27.79 |
| 4 | Mark Warnecke | Germany | 27.87 |
| 5 | Darren Mew | Great Britain | 27.92 |
| 6 | Alessandro Terrin | Italy | 27.98 |
| 7 | Emil Tahirovič | Slovenia | 28.17 |
| - | Mladen Tepavčević | Yugoslavia | DQ |

### Semifinals

| Rank | Heat + Lane | Swimmer | Nation | Time | Notes |
| 1 | S2 L4 | James Gibson | Great Britain | 27.46 | q, CR |
| 2 | S2 L5 | Oleg Lisogor | Ukraine | 27.86 | q |
| 3 | S1 L5 | Mark Warnecke | Germany | 27.91 | q |
| 4 | S1 L7 | Darren Mew | Great Britain | 27.98 | q |
| 5 | S1 L4 | Mihály Flaskay | Hungary | 28.03 | q |
| 6 | S1 L6 | Alessandro Terrin | Italy | 28.09 | q |
| 7 | S2 L8 | Mladen Tepavčević | Yugoslavia | 28.10 | q |
| 8 | S2 L3 | Emil Tahirovič | Slovenia | 28.12 | q |
| 9 | S1 L1 | Károly Güttler | Hungary | 28.13 | |
| 10 | S2 L6 | Brenton Rickard | Australia | 28.16 | |
| 11 | S2 L2 | Jens Kruppa | Germany | 28.32 | |
| 12 | S1 L2 | Matjaž Markič | Slovenia | 28.33 | |
| 13 | S2 L7 | Ed Moses | USA | 28.36 | |
| 14 | S1 L3 | Jarno Pihlava | Finland | 28.39 | |
| 15 | S1 L8 | Remo Lütolf | Switzerland | 28.45 | |
| 16 | S2 L1 | Morten Nystrom | Norway | 28.52 | |

### Preliminaries

| Rank | Heat+Lane | Swimmer | Nation | Time | Notes |
| 1 | H14 L5 | James Gibson | Great Britain | 27.54 | q |
| 2 | H13 L4 | Mihály Flaskay | Hungary | 27.84 | q |
| 3 | H14 L4 | Oleg Lisogor | Ukraine | 27.85 | q |
| 4 | H14 L3 | Mark Warnecke | Germany | 27.96 | q |
| 5 | H14 L1 | Emil Tahirovič | Slovenia | 27.97 | q |
| 6 | H12 L8 | Jarno Pihlava | Finland | 28.04 | q |
| 7 | H12 L7 | Brenton Rickard | Australia | 28.13 | q |
| 7 | H13 L3 | Alessandro Terrin | Italy | 28.13 | q |
| 9 | H12 L5 | Jens Kruppa | Germany | 28.18 | q |
| 10 | H14 L6 | Matjaž Markič | Slovenia | 28.19 | q |
| 11 | H13 L2 | Ed Moses | United States | 28.25 | q |
| 12 | H12 L4 | Darren Mew | Great Britain | 28.27 | q |
| 13 | H13 L8 | Morten Nystrøm | Norway | 28.32 | q |
| 14 | H13 L5 | Károly Güttler | Hungary | 28.34 | q |
| 15 | H13 L5 | Mladen Tepavčević | FR Yugoslavia | 28.42 | q |
| 16 | H12 L1 | Remo Lütolf | Switzerland | 28.44 | q |
| 16 | H14 L2 | Morgan Knabe | Canada | 28.44 | |
| 18 | H11 L7 | Martin Gustavsson | Sweden | 28.51 | |
| 19 | H11 L5 | Chris Stewart | South Africa | 28.54 | |
| 20 | H10 L6 | Jim Piper | Australia | 28.61 | |
| 21 | H14 L7 | Eduardo Fischer | Brazil | 28.67 | |
| 22 | H11 L3 | Dave Denniston | United States | 28.74 | |
| 23 | H13 L7 | Qiliang Zeng | China | 28.80 | |
| 24 | H13 L6 | Vanja Rogulj | Croatia | 28.83 | |
| 25 | H12 L2 | Dmytro Krayevskyy | Ukraine | 28.84 | |
| 26 | H14 L8 | Felipe Santos | Brazil | 28.87 | |
| 27 | H13 L1 | Daniel Málek | Czech Republic | 28.88 | |
| 28 | H08 L7 | Arsenio López | Puerto Rico | 28.92 | |
| 29 | H11 L8 | Makoto Yamashita | Japan | 28.93 | |
| 30 | H09 L7 | Mike Brown | Canada | 29.00 | |
| 30 | H10 L4 | Malick Fall | Senegal | 29.00 | |
| 32 | H11 L6 | Vlad Polyakov | Kazakhstan | 29.05 | |
| 33 | H10 L2 | Alwin de Prins | Luxembourg | 29.11 | |
| 34 | H11 L4 | Haibo Wang | China | 29.18 | |
| 35 | H10 L7 | Sofiane Daid | Algeria | 29.28 | |
| 36 | H09 L4 | Jon Oddur Sigurdsson | Iceland | 29.49 | |
| 37 | H08 L8 | Rastislav Kanuk | Slovakia | 29.55 | |
| 38 | H08 L2 | Seung Hun You | South Korea | 29.63 | |
| 39 | H09 L5 | Andrew Bree | Ireland | 29.65 | |
| 40 | H09 L3 | Dov Malnik | Israel | 29.78 | |
| 41 | H10 L3 | Andrey Ivanov | Russia | 29.79 | |
| 42 | H08 L3 | Wickus Nienaber | Swaziland | 29.82 | |
| 43 | H11 L2 | Álvaro Fortuny | Guatemala | 29.85 | |
| 44 | H09 L8 | Grant Galant | South Africa | 29.90 | |
| 45 | H11 L1 | Juan Jose Madrigal | Costa Rica | 30.04 | |
| 46 | H10 L1 | Francisco Suriano | El Salvador | 30.06 | |
| 47 | H09 L6 | Jakob Sveinsson | Iceland | 30.14 | |
| 48 | H07 L5 | Ranui Teriipaia | Tahiti | 30.16 | |
| 48 | H07 L7 | Željko Panić | Bosnia and Herzegovina | 30.16 | |
| 50 | H09 L1 | Maksim Shilov | Uzbekistan | 30.25 | |
| 51 | H07 L1 | Eric Williams | Nigeria | 30.27 | |
| 52 | H07 L3 | Francisco Picasso | Uruguay | 30.42 | |
| 53 | H09 L2 | Oleg Sidorov | Uzbekistan | 30.58 | |
| 54 | H06 L5 | Raphael Matthew Chua | Philippines | 30.65 | |
| 55 | H08 L4 | Cheuk Lun Li | Hong Kong | 30.67 | |
| 56 | H08 L5 | Chi Kin Tam | Hong Kong | 30.69 | |
| 57 | H07 L2 | Ahmed Al-Kuhmani | Saudi Arabia | 30.70 | |
| 58 | H07 L8 | Chan Wai Ma | Macau | 30.77 | |
| 59 | H10 L8 | Jean-Luc Razakarivony | Madagascar | 30.79 | |
| 60 | H07 L6 | Baktash Gheidi | Iran | 30.89 | |
| 61 | H06 L8 | Kevin Hensley | Virgin Islands | 31.02 | |
| 62 | H06 L2 | Santiago Cavanagh | Bolivia | 31.21 | |
| 63 | H06 L6 | Terrence Haynes | Barbados | 31.28 | |
| 63 | H07 L4 | Antonio Leon | Paraguay | 31.28 | |
| 65 | H08 L1 | Marc Dansou | Benin | 31.34 | |
| 66 | H06 L7 | Conrad Francis | Sri Lanka | 31.53 | |
| 67 | H06 L4 | O. Igbekele Ayenuwa | Nigeria | 31.63 | |
| 67 | H06 L3 | Khaly Ciss | Senegal | 31.63 | |
| 69 | H05 L7 | Chad Miller | Fiji | 32.10 | |
| 70 | H05 L2 | Onan Thom | Guyana | 32.26 | |
| 71 | H05 L8 | Amar Shah | Kenya | 32.29 | |
| 72 | H05 L6 | Chisela Kanchela | Zambia | 32.31 | |
| 73 | H04 L3 | Hei Meng Lao | Macau | 32.86 | |
| 74 | H08 L6 | Daniel Kang | Guam | 33.41 | |
| 75 | H05 L1 | Joao Matias | Angola | 33.72 | |
| 76 | H04 L5 | Enkhmandakh Khurlee | Mongolia | 33.90 | |
| 77 | H03 L5 | Yan Lin Aung | Myanmar | 34.28 | |
| 77 | H04 L6 | Alice Shrestha | Nepal | 34.28 | |
| 79 | H03 L3 | Peter James Linch | Zambia | 34.63 | |
| 80 | H03 L1 | Connor H. Keith | Guam | 34.76 | |
| 81 | H04 L7 | Clark Randrianandraina | Madagascar | 34.83 | |
| 82 | H04 L1 | Omar Jasim | Bahrain | 34.95 | |
| 83 | H01 L6 | Ronald Ying | Guyana | 34.98 | |
| 84 | H03 L2 | Guvanch Ataniyazov | Turkmenistan | 35.25 | |
| 85 | H02 L5 | Bounthanom Vongphachanh | Laos | 35.81 | |
| 86 | H03 L6 | Stephenson Wallace | Saint Vincent and the Grenadines | 36.13 | |
| 87 | H03 L4 | Issam Halawani | Palestine | 36.35 | |
| 88 | H02 L6 | Lamine Alhousseini | Niger | 36.41 | |
| 89 | H03 L8 | Sikhounxay Ounkhamphanyavong | Laos | 37.16 | |
| 90 | H02 L2 | Hem Lumphar | Cambodia | 37.28 | |
| 91 | H02 L3 | Donnie Defreitas | Saint Vincent and the Grenadines | 37.52 | |
| 92 | H04 L8 | Ganzi Mugula | Uganda | 37.55 | |
| 93 | H02 L1 | Joshua Marfleet | Samoa | 39.69 | |
| 94 | H02 L7 | Ali Maiga Akibou | Niger | 41.95 | |
| - | H02 L4 | Dawson Grace | Samoa | DQ | |
| - | H05 L5 | Iyad Houseya | Palestine | DQ | |
| - | H06 L1 | Jamie Peterkin | Saint Lucia | DQ | |
| - | H10 L5 | Andrei Capitanciuc | Moldova | DQ | |
| - | - | Kosuke Kitajima | Japan | DNS | |
| - | - | Ahmed Ouattara Zie | Ivory Coast | DNS | |
| - | - | Aiah Emerson Mansa Musai | Sierra Leone | DNS | |
| - | - | Ben Traore | Ivory Coast | DNS | |
| - | - | Natalya Filina | Azerbaijan | DNS | |
| - | - | Alain Ives Mewoutou | Cameroon | DNS | |
| - | - | A.A. Romain Belemtougri | Burkina Faso | DNS | |
| - | - | Shade Sule Cole | Cameroon | DNS | |
| - | - | Herve Nkurunziza | Burundi | DNS | |
| - | - | Emery Nziyumvira | Burundi | DNS | |
Notes:
* ^ Filina: Natalya Filina was mis-entered in the men's event, rather than the women's event.