Richie Porte is the defending champion and Peter Sagan has shown he has brought strong form to the Tour Down Under.
THE 20TH TOUR DOWN UNDER - WHAT YOU NEED TO KNOW
* Six-stage race, from Tuesday to Sunday in and around Adelaide.
* Australian Richie Porte (BMC) is the defending champion and the man to beat, despite having done little racing since last year's Tour de France crash.
* Three-time defending world road champion Peter Sagan (Bora-Hansgrohe) won the People's Choice Classic on Sunday night, so he's come to Adelaide with strong form.
* It's a top-class field of sprinters - Australian Caleb Ewan (Mitchelton-Scott), German Andre Greipel (Lotto-Soudal), Italian Elia Viviani (Quick Step) and Sagan.
* Once again, the composite UniSA team features some of Australia's top rising stars, including Olympic track medallist Miles Scotson.
* As always, the Queen Stage at Willunga on Saturday with its summit finish will confirm the overall winner. Porte has won there for the last four years.
* The Tour gained WorldTour status in 2008 and gained a massive boost when Lance Armstrong started his comeback in Adelaide the following year. It is Australia's top bike race.
* Many Australian riders have the Tour as their main early-season focus. Internationals such as Sagan and Greipel use it as a solid training hitout ahead of the European spring classics.
* Simon Gerrans has won a record four times (2006, 2012, 2014, 2016) and will ride for Porte after switching from Mitchelton-Scott.
* Greipel has won twice (2008, 2010) and has the record number of stage wins (16).
* Dutch rider Tom Jelte-Slagter (2013) was the last international winner and is back at the race this year with Dimension Data.
* Stuart O'Grady (1999, 2001) gave the Tour a massive boost in its first year as the local winner.
* No winner has successfully defended his title.