Who is Australia's greatest athlete in 2015?
Who is the most skilful? The strongest? The sportsperson with the best endurance? The toughest mentally?
In coming weeks, Sportal is on a mission to find out - in Australia's Greatest Athlete Challenge.
Every Tuesday, we'll be tapping into our range of Opta sports data to find the weekly Australian sporting standout in the areas of skill, strength and endurance based on their performances each week.
Our world-leading Opta data will highlight the best performances every week in each of those three categories - skill, strength and endurance.
And in a fourth category - mental toughness - our writers will highlight whose mental game we thought was the standout of the week.
Then, over to you.
We want you to vote for what you think is the best performance of the week, and overall, in our Australia's Greatest Athlete Challenge.
You can have your say via social media using the hashtag #challengeyourself and on the Sportal website. Let us know your thoughts of the performances of the week, or if you have a different opinion.
So to get the debate started, here's some picture galleries featuring great Australian sporting performances through history in all four categories.
Now challenge yourself. Who's your favourite Australian performer in each of the four categories?
#challengeyourself
