The Tamil Nadu runner clocked a personal best time of 45.92 ( his previous best being 46.13 ) and held off Japan 's Yuzo Kanemaru 's challenge for the bronze medal .
The Tamil Nadu runner had won his semifinal heat yesterday .
The Tamil Nadu runner , who had won his semifinal heat yesterday , clocked a personal best time of 45.92 ( his previous best being 46.13 ) and held off Japan 's Yuzo Kanemaru 's challenge for the bronze medal .