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In 2018, he was controversially selected to compete in 800 m at the 2018 Commonwealth Games, Gold Coast, Queensland after not qualifying for the final at the Australian Athletics Championships. But in the B final he ran a personal best of 1:45.71 and was subsequently selected. At the Games, he finished seventh in the 800m final in 1:47.20. On 20 July 2018, at the IAAF Diamond League meeting in Monaco he finished seventh in the 800m but broke the Australian record with a time of 1:44.21. The previous Australian record of 1:44.40 was set by Ralph Doubell in winning the gold medal at altitude at the 1968 Mexico Olympics and equaled in 2014 by Alexander Rowe in Monaco. Deng's record also broke New Zealander Peter Snell's Oceania record of 1:44.3 that was set in Christchurch in 1962. At the end of the 2018 season, Deng had run four times under 1.45 in the year, the most ever by an Australian.

At the age of 17, he was selected in the Australian team for the 2016 IAAF World U20 Championships. He finished third in the 800 m semi-final in 1:48.49 but failed to qualify for the final. Later in 2016, he ran a personal best of 1:46.51. In 2016, he moved to Melbourne to be coached by Justin Rinaldi who coached Alexander Rowe to run 1:44.40, equalling the Ralph Doubell 's Australian record.

Joseph Deng (born 7 July 1998) is an Australian middle-distance runner of South Sudanese heritage. In July 2018, he broke the 800m Australian record with a time of 1:44.21, which had stood since the 1968 Mexico Olympics.

Deng was born in Kakuma, Kenya where a UNHCR refugee camp was established in 1969. His mother Rebecca left Sudan to escape the Second Sudanese Civil War. In 2004, his family moved to Toowoomba, Queensland when he was six and in 2010 he moved to Ipswich at the age of 12. He first attended Raceview State School and then Ipswich Grammar School. In an interview, Deng said that "he identifies himself as Sudanese, he identifies himself as Australian."