Teenage sprint phenomenon Gout Gout has smashed his own national 200m record and become the first Australian to break the 20-second barrier in legal conditions as he sprinted to victory in 19.67sec at the athletics championships in Sydney.

Aidan Murphy pushed the 18-year-old deep into the straight and finished with the second best 200m time by an Australian of 19.88sec, with a tailwind of +1.7m/s.

Gout previously held the national record of 20.02sec and ran a wind-assisted 19.84sec (+2.2m/s) at the Australian Athletics Championships last year, but blew away both times in the final on Sunday.