Alize Cornet had never made it past the fourth round of a major.
The venue is Melbourne Park.
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Simona Halep, a two-time Grand Slam winner, lost in three sets to France's Alize Cornet in the Australian Open.
In the heat of 32C, the French player won the match and advanced to the quarter-finals of a major for the first time.
Halep had won all eight of her previous matches.
The winner of the match between Danielle Collins and the world number 61 will play in the semi-finals.
Collins came from behind to beat Mertens.
Second seed Aryna Sabalenka plays Kaia Kanepi and seventh seed Iga Swiatek plays Sorana Cirstea on Monday.
"To go to my first quarter-final is just a dream come true, I don't know what to say, it is just magic," said 32-year-old Cornet.
I stopped thinking after 30 minutes of playing my brain was already overloading, my vision wasn't clear anymore, and my hands were shaking, but on the other side of the court she was not feeling much better than me.
I keep playing tennis because I can share my emotions on the court with you. I can't believe the journey continues.
At the 2005 French Open, Alize Cornet made her first main draw appearance.
Halep breezed through her opening three matches at the Australian Open for the loss of just 12 games, after winning the Adelaide WTA event in the build-up to the tournament.
Playing her sixth fourth-round match at a Grand Slam, Cornet won the opening set with five breaks of serve, but Halep saved a set point with a forehand.
The determined Halep battled back in impressive fashion, winning five consecutive games to level the match, as Cornet appeared to be in control as she recovered from an opening break to take a 3-1 lead in the second set, and had a point to go up 4-1, but the determined Halep battled
With both players being tested by long rallies in the heat, the French player survived a break point to hold for 3-3 in the deciding set, and Halep threw her racquet in frustration.
In her 63rd career Grand Slam appearance, she delivered the decisive blow in the following game, winning four points in a row from 30 0 down.
Despite being unable to take two match points on Halep's next service game, Cornet took her third on her own serve and sank to her knees.