Swimming World Championships 2003 at Barcelona (spa) Men: 100 m Backstroke July 22: Final: 1. Aaron Peirsol (usa) 53.61 2. Arkady Vyatchanin (rus) 53.92 2. Matt Welsh (aus) 53.92 4. Steffen Driesen (ger) 54.17 5. Markus Rogan (aut) 54.53 6. Tomomi Morita (jpn) 54.86 7. Laszlo Cseh (hun) 54.95 8. Alex Lim (mls) 55.18