Ewan had dominated the sprints throughout the race, and so it proved once again on the the final stage of the race, coming into the final 250 metres in a perfect position, and holding off two-time world champion Peter Sagan (Bora-Hansgrohe) to win the stage by half a bike length.
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The 90km criterium around the city centre of Adelaide provided intriguing racing as podium places changed hands with Jay McCarthy (Bora-Hansgrohe) picking up bonus seconds at an intermediate sprint to move leapfrog Nathan Haas (Dimension Data) into third place overall.
There was also success for Thomas De Gendt (Lotto-Soudal) who was ever-present in the various breakaways, picking up enough mountain points to take that classification ahead of Porte.
However, the day as a whole belonged to Porte and Ewan, as the two Australian riders completed their dominance of the 2017 Tour Down Under.