Swimming World Championships 1973 at Beograd (yug) Men: 100 m Butterfly September 8: Final: 1. Bruce Robertson (can) 55.69 2. Joe Bottom (usa) 56.37 3. Robin Backhaus (usa) 56.42 4. Hartmut Flöckner (ege) 56.75 5. Ross Seymour (aus) 57.33 6. Jorge Delgado (ecu) 57.41 7. Neil Rogers (aus) 57.58 8. Folkert Meeuw (wge) 57.81