Suddenly, what once looked like a tournament that would go the way of the chalk has become a bit unpredictable heading into Day 9—at least on the women's side.
Both No. 1 seed Serena Williams and No. 3 seed Maria Sharapova were ousted before reaching the quarterfinals. Only No. 4 seed Li Na as well as No. 2 seed and two-time defending champion Victoria Azarenka remain amongst the top four seeded players in the tournament.
As for the men's side of the draw, the biggest names continue to roll. All of the four top seeds are still playing and seven of the top eight make up the quarterfinal field.
Here's a closer look at the action on tap for Tuesday in Melbourne.
The Upstarts on the Women's Side
Eugenie Bouchard vs. Ana Ivanovic
The two lowest remaining seeds on the women's side will be in action on Tuesday. 30th seed Eugenie Bouchard defeated Casey Dellacqua 6-7 (5-7), 6-2, 6-0 in the fourth round. Dellacqua was the last Australian left on either side of the draw.
Lagardère Unlimited notes the Canadian's historic run:
Bouchard will take on No. 14 seed Ana Ivanovic in the quarterfinals. Ivanonvic pulled off the tournament's biggest shocker to date. After failing to win a set in any of the four previous matches with world No. 1 Williams, the 26-year-old Serbian prevailed 4-6, 6-3, 6-3 in the fourth round.
Ivanovic is the higher seed, but Bouchard won their only previous meeting in 2013 in straight sets. Still, Ivanovic has already proven she's capable of bucking the trend in Melbourne.
Na will represent a stiff challenge for No. 28 Flavia Pennetta. The 32-year-old Italian did knock off No. 8 seed Angelique Kerber 6-1, 4-6, 7-5 in the fourth round, but Na has been quietly dominant.
She's dropped just one set in the tournament and looks poised to continue her strong play.
Though the two women haven't played in four years, Pennetta won the last meeting and has taken two of the three matches in their head-to-head series.
The bottom portion of the men's draw seems to belong to Novak Djokovic. The three-time defending champion hasn't lost a set yet and none of the players on his side of the draw have fared well against him.
Djokovic has won 17 of the 19 matches against his quarterfinal opponent Stanislas Wawrinka. If Djokovic beats Wawrinka, he'll face the winner of Tuesday's other quarterfinal match in the men's draw between Tomas Berdych and David Ferrer.
He's won 15 of 17 matches against Berdych and 14 of 19 against Ferrer, including the last eight meetings. Don't expect to see him challenged until he reaches the final.
ESPN Tennis sat down with Djokovic after his dominant 6-3, 6-0, 6-2 win over Fabio Fognini in the fourth round:
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