It's time to sort the wheat from the chaff at Melbourne Park.
And whilst there have been comparatively few upsets in the men's singles draw at the Australian Open, Australia will be relying on one if it wants a local to make the quarter-finals.
Fresh off disposing of fellow Australian John Millman in the third round, 16th seed Bernard Tomic faces the second seed, Britain's Andy Murray, on Monday night in the last sixteen.
Typically, the 23 year-old isn't lacking confidence, even heading into such a big challenge.
"You know, I just feel so confident on court. Anyone can beat anyone, especially with the tennis I'm playing. So I go out there believing I can win, and focus on my service games. And I know I'll get some chances on his (service games)."
The women's singles draw so far has been what one might like to call predictably unpredictable.
It was forecast to be more open than the men's competition coming into the tournament- and it hasn't let anyone down in that regard.
Underdog Daria Gavrilova has been grabbing most of the local headlines, and two of the top four seeds didn't even make the last 16.
Tuesday may tell much of the story about who will emerge with the championship next weekend.
It's then that Serena Williams, the number one seed, plays number five seed Maria Sharapova in a quarter-final.
The pair have won 26 Grand Slam singles titles between them - Williams 21, Sharapova five - and met in the final here last year.
Williams took that match in straight sets, and doesn't seem too concerned about the heavyweight matchup this time around either.
She told Channel Seven straight after her fourth round win she wasn't even aware Sharapova would be her quarter-final opponent.
"Yeah, I had no idea! It'll be a good match. She had a really good win today. And again, I really have nothing to lose. We both are just doing the best that we can. So we'll have fun."
Tuesday will also be a big day in the A-League.
Rivals Melbourne Victory and Sydney FC are set to meet in Melbourne to conclude Round 16.
Sydney will be looking for a big away win to leapfrog local rivals Western Sydney Wanderers atop the competition ladder.
The Wanderers reclaimed top spot after a late winner from Brendan Santalab gave them a 2-1 win over the Central Coast Mariners, spoiling Luis Garcia's debut for the Gosford-based club.
Despite the defeat, Garcia who played slightly more than half an hour as a substitute, says he had fun in his first game in the A-League.
"Yeah, I enjoyed it very much. From the first second I got onto the pitch, I enjoyed it. The crowd was fantastic today. We hope the supporters hang (on) until the end of the season, and hopefully we can give them a lot of joy."
Top spot became available for the Wanderers to claim after previous leaders Brisbane Roar suffered their second straight big loss, 4-1 to Adelaide on Friday night.
In the round's other match so far, Perth easily accounted for Newcastle, 6-1.
Melbourne City plays Wellington on Monday.
The A-League finals don't roll around until April, but the W-League finals are already here.
Sydney FC has upset Canberra United 1-0 to book a spot in next weekend's Grand Final.
A controversial goal from Jasmyne Spencer proved the winner, the referee awarding it despite the fact Canberra goalkeeper Lydia Williams appeared to be illegally impeded.
Melbourne City will be hot favourites to join Sydney in the Grand FInal when they Brisbane Roar in the other semi-final on Monday.
In cricket, after India's consolation victory in the last match of the one day international series against Australia, the focus on the international scene turns to Twenty20.
A best of-three series for both men's and women's teams between Australia and India starts in Adelaide on Tuesday- which is, of course, the national day for both countries.
Australia's mens team acting coach Michael Di Venuto says the series is important preparation for the Twenty20 World Cup, to be held in India in March and April.
"I think the whole squad...our goal is to be number one in the world in all three forms (of cricket). The Twenty20 World Cup is something that we haven't won, and that's something that we want to win. So, we've got three games now, and then we've got three games in South Africa before that World Cup starts. So, we want to get a bit of momentum before we hit that tournament."
Di Venuto is acting coach because regular coach Darren Lehmann is out of action after being diagnosed with Deep Vein Thrombosis.
And in cycling, Simon Gerrans is Tour Down Under champion for the fourth time.
He beat out fellow Australia Richie Porte for the title, with Colombian Sergio Henao finishing third.
Although he took out the ultimate individual honour, Gerrans was quick to credit his Orice-Greenedge team mates when he spoke to Channel Nine after the final stage.
"Yeah, I couldn't have asked any more of the guys this week. They really did a sensational job. Today, they just kept me up the front, out of trouble. But, yeah, what a fantastic week!"
No one other than Gerrans has won the Tour Down Under more than twice.
