Swimming World Championships 2007 at Melbourne (aus) Men: 100 m Backstroke March 27: Final: 1. Aaron Peirsol (usa) 52.98 (WR) 2. Ryan Lochte (usa) 53.50 3. Liam Tancock (gbr) 53.61 4. Arkady Vyatchanin (rus) 53.69 5. Markus Rogan (aut) 53.78 6. Gerhard Zandberg (saf) 54.59 7. Matt Welsh (aus) 54.65 8. Tomomi Morita (jpn) 55.04