"It's always a physical match", Sharapova told reporters of her third-seeded opponent looming in the next round, with Wozniakci having won her first Grand Slam here previous year. One day you win; some days you lose.
Tournament second seed Angelique Kerber cruised into the fourth round of the competition as the German overcame Australian wildcard Kimberly Birrell 6-1, 6-0. She celebrated with a huge yell and then broke Wozniacki again to claim victory, finishing with a tally of 37 winners, compared to just 10 for her opponent.
The Russian was not to be denied in the third set, however, as she closed out the win on her second match point in two hours and 24 minutes.
But the 28-year-old refused to beat herself up about the loss, saying she had left everything on the court in her third round clash against the Russian.
But against Wozniacki she proved she still has the talent - and, most importantly, desire - to cause problems for the world's best.
"These are the types of matches I train for so it's really rewarding to win that last point".
American Sloane Stephens, seeded fifth, beat Croatia's Petra Martic 7-6 (6) 7-6 (5) to move into the fourth round where she meets Anastasia Pavlyuchenkova.
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"I was feeling very confident with my shots and ready to go after it, and I did that from the very first point".
The former world number one came into the first Grand Slam of the year with little hype, perhaps because she has not gone past the last 16 at a major since winning in Melbourne and lost to Canadian teenager Bianca Andreescu in Auckland earlier this month. Sharapova has now won on seven occasions. The defending champion in women's singles at the Australian Open is gone. Wozniacki, on the other hand, has been in exceptional form in the past few years.
Barty beat Greece's Sakkari 7-5, 6-1, with the 15th seed yet to drop a set in her best performance at Melbourne Park.
"I thought the level was quite high".
Unseeded American Amanda Anisimova continued her dream run, ousting 11th seed Aryna Sabalenka in straight sets 6-3, 6-2.
Players, staff and media all wear identification badges on lanyards around their necks to access secure areas at Melbourne Park and even Federer was not allowed to breeze through without it.
Sharapova and Wozniacki appear to have a frosty relationship.