As the 21-year-old wraps up his domestic summer at this week’s Herald Sun Tour, he is also thinking about the sprint giants who are his real test.

For Ewan to realise his potential, he must start consistently beating riders such as Mark Cavendish, Andre Greipel and John Dekenkolb.

“I know the top five sprinters in the world are still going to be the ones who I want to beat,” he said.

“They’re going to be hard to beat… so until I can actually get a few wins against some of those top guys, my confidence is still probably not as high as it would want to be.”

Ewan started the year by winning the Mitchelton Bay Classic, followed by the criterium at the national road titles and also two stages at the Santos Tour Down Under.

He is Australia’s best sprint prospect since Robbie McEwen.

Once the Orica-GreenEDGE rider goes to Europe, he will aim for the May Giro d’Italia.

Ewan will probably complete only half the three-week race – a reasonable goal for such a young rider – and try to pick up one or two stage wins in the process.

“There will be some good sprinters there, so it will be a good test,” he said.

There is a growing spotlight on Ewan and, so far, he has handled the attention admirably.

“It’s nice – obviously it comes with winning,” he said.

“I’d prefer it being like that – winning and having the extra media, that kind of stuff.”

Caleb Ewan celebrates winning Stage 1 of the Tour Down Under in Lyndoch. Photo: Dan Peled, AAP.

The Tour opens with tonight’s prologue time trial in Melbourne and Ewan missed out on the win last year by just one second.

If conditions are dry, he will go for the win again.

But his main personal goal this week will be taking out a stage.

Then Ewan will try to help a teammate achieve a high overall result.

Orica-GreenEDGE have won the last two Tours, but Simon Clarke and Cam Meyer are now at rival teams.

Fellow rising stars Jack Haig and Damien Howson are probably their best chances for the overall win.

Meanwhile, emerging Adelaide star Patrick Constable will contest the Australian track championships in his home city starting today with national sprint coach Gary West bullish about his prospects.

“He’s doing stuff that I haven’t seen other athletes of his age do in sprinting,” West said of the 20-year-old.

Constable last month banked the biggest win of his burgeoning career, taking out the sprint final at a World Cup meet in Hong Kong.

“Hong Kong was reward for effort,” West said.

“He has a maturity above his years and he’s grounded. He’s just someone who takes it in his stride – nothing fazes him.

“He’s not dissimilar to Matthew Glaetzer in a lot of ways… I don’t know many kids of his age, male or female, who are like this – he’s a ripper.”

Constable looms as a danger to Glaetzer’s dominance at the national championships, where the world No.1 is seeking a third consecutive sprint title.

The individual sprint will be held tomorrow, with today’s opening day of the championships highlighted by the men’s and women’s team pursuit and team sprint.

-AAP