FILE PHOTO - Mar 9, 2018; College Station, TX, USA; Michael Norman of Southern California wins 400m heat in 45.56 for the top qualifying time during the NCAA Indoor Track and Field Championships at the McFerrin Athletic Center. Kirby Lee-USA TODAY Sports
(Reuters) - American Michael Norman broke the world indoor 400 metres record when he clocked 44.52 second at the U.S. collegiate championships in College Station, Texas on Saturday.
The University of Southern California sprinter, running just his third indoor 400m final, took 0.05 seconds off the previous record of Kerron Clement at the 2005 U.S. collegiate championships.
