A premier match this weekend features former champions Angelique Kerber and Maria Sharapova.
In other third-round matches, Argentine 12th seed Juan Martin Del Potro plays tough Czech campaigner Tomas Berdych while fourth seed Alexander Zverev takes on South Korea's Chung Hyeon.
The match included 48 games, which ties the most for a women's encounter in Australian Open history, as two of the most diminutive players on tour played out an epic.
But she finally got over the line 4-6, 6-4, 15-13 in a gruelling three-hour-44-minute on Rod Laver Arena, to make the fourth round in a contest that took its toll. The decider would be longer than the first two sets combined. The German 21st seed needed only 64 minutes to beat the unseeded Russian 6-1, 6-3 to reach the last 16. "I'm nearly dead", she said.
Halep, a former quarter-finalist, will next play Naomi Osaka in her quest for a maiden Grand Slam title after the Japanese star beat Australia's Ashleigh Barty.
The victor will be rewarded with a clash against either Poland's Agnieszka Radwanska or Taiwan's Hsieh Su-wei.
Bouchard did manage her only hold to leave it 2-1, but Halep won the next five games to seal an emphatic victory in only 65 minutes.
French eighth seed Caroline Garcia came through in three sets 6-3 5-7 6-2 against Belarus' Aliaksandra Sasnovich.
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He will face either six-time champion Novak Djokovic in Monday's fourth round. Unexpectedly, the American regained her composure and found her groove once more, grabbing back the break by prevailing in a marathon rally. Keys has lost three times to players ranked outside Top 100 at majors: No.290 Martic (2017 Roland Garros), No.133 S.Zhang (2016 Australian Open) and No.145 Krunic (2014 US Open).
"But I think after this I'm just going to really focus on all that I did well and just how well I handled myself at this tournament and just how well I played". "We were both fighting our hearts out", said the exhausted Davis.
Roger Federer has arguably the most lovely single-handed backhands in tennis. With the score 1-1 at 15-all in the first set, Halep looked crisp during a fiery 20-shot rally that ended with her forehand victor.
"But, why not?" asked Jim Courier on court after the Swiss trounced Richard Gasquet in straight sets.
"I just kept believing that it's not over, even if she's leading a little bit more".
On Courier's request, Federer also performed the 'smoldering intensity' on court.
Despite facing the incredible amount of pressure, the world number 76 remained on serve while Halep failed to convert all her chances. It happened in NY. The Australian Open remains the only Grand Slam that Nadal has only won once before.
"I'm gluten-free. They don't have a gluten-free pasta".