At Little Athletics, he excelled at every type of event including 800m, long jump and sprints, and cross-country.

Dubler competed as Australia's first decathlete in 16 years[4] at the 2016 Summer Olympics in Rio de Janeiro, placing 14th.

Dubler continued to make improvements in the 110m hurdles, discus, and pole vault, and at the National Championships and Commonwealth Games trials he achieved PBs in the 100m, shot, 110m hurdles, pole vault, javelin, and 1500m.

[3] At the 2020 Tokyo Olympic Games, Dubler gained admiration for sacrificing his own final 1500m leg of the decathlon to act as a "pacer" and motivator for Ashley Moloney.

Dubler's selflessness was acknowledged by many commentators as being instrumental in Moloney's bronze medal win,[6] and was lauded by the Australian media as one of the most memorable moments of the Tokyo Olympics.