Johnson runs down world record in 400.

Michael Johnson shattered another world record Thursday night -- this time, breaking the 400-meter mark with a sensational clocking of 43.18 seconds at the World Championships. In clipping .11 seconds off the record of 43.29 set by Butch Reynolds in 1988, Johnson gave a performance reminiscent of his 200-meter triumph at the 1996 Olympics. With his all-gold shoes flashing on the Atlanta track, he clocked an astounding 19.32, cracking his 200 world record by .34 seconds. Though the difference was not as huge this time, Johnson and his black-and-gold shoes still left his pursuers far behind, with runner-up Sanderlei Parrela of Brazil more than one second back at 44.29. It was only the second time in 31 years that the 400 record has been broken. Lee Evans_ record of 43.86, set in the 1968 Mexico Olympics, stood for 20 years before Reynolds broke it. Johnson is only the second runner to hold both long sprint records at the same time. The other was Tommie Smith, who owned the 220-yard record from 1966-68 and the 440-yard mark from 1967-68.