Swimming at the 2000 Summer Olympics – Men's 100 metre backstroke Semifinal 1 Semifinal 1

| Rank_ | Lane | Name_ | Nationality | Time_ |
|---|---|---|---|---|
| 1 | 4 | Matt Welsh | Australia | 54.52 |
| 2 | 5 | Josh Watson | Australia | 54.93 |
| 3 | 3 | Neil Walker | United States | 55.20 |
| 4 | 1 | Chris Renaud | Canada | 55.70 |
| 5 | 2 | Alexandre Massura | Brazil | 56.07 |
| 6 | 6 | Gordan Kožulj | Croatia | 56.26 |
| 7 | 7 | David Ortega | Spain | 56.33 |
| 8 | 8 | Adam Ruckwood | Great Britain | 56.34 |