The Canadian's win sets up a semi-final clash with Del Potro on Saturday that will pit power against power.
World No 1 Novak Djokovic, second seed Andy Murray and three-time champion Rafael Nadal were all cheered into the quarter-finals of the Rogers Cup on Thursday.
The Slovakian eventually won 6-4, 6-1 but the match will be remembered for a ludicrous umpiring decision at a crucial stage of a tight opening set.
The 20-year-old, free of a shoulder injury that forced her out of qualifying for last week's Hobart tournament, won her first match at the Australian Open at her fourth attempt with a 6-4, 7-5 victory over Germany's Annika Beck.
Serena Williams sounded a warning for her fellow Australian Open contenders with a sleek win
Images from Day 1 of the 2020 French Open, in Paris, on Sunday.
"Think of it from a players' perspective. Some are hoping to reach the second week of a major but some don't even make it to the first week of the event. That's tough to take.
The 36-year-old Swiss master needs only to reach the semi-finals at the ABN Amro tennis event to overtake Rafael Nadal at the top of the ATP rankings and become world number one for the first time since November 2012.
One year after shaking off a crippling foot injury to claim a stunning US Open victory, Sloane Stephens said her follow-up season felt just as good as the American prepares to play in next week's WTA Finals for the first time.
Top seed Angelique Kerber was knocked out of the last-16 of Wimbledon by Garbine Muguruza on Monday, ensuring she will lose her world number one ranking.
That is Murray's 46th ATP title.
List of Australian Open women's singles champions since the event began in 1922 (Australian unless stated):
Czech defending champion Katerina Siniakova fended off Maria Sharapova in a fiercely contested match at the Shenzhen Open on Friday to set up a final with world number one Simona Halep.
World number one Novak Djokovic blasted past qualifier Alexei Popyrin 6-4, 6-2 to reach the second round of the Japan Open Tennis Championships in Tokyo.
France's Alize Cornet thrashed an error-prone Eugenie Bouchard 6-1, 6-2 to win the Hobart International title on Saturday.
The professional tennis circuit, which requires players to jet around the world, was forced into shutdown in early March as countries went into lockdown and closed their borders to contain the spread of the novel coronavirus.
Serena William powered her way to within two victories of a seventh US Open title on Tuesday and while she refused to look ahead there are many willing to do it for her, and what they see is a suddenly open path to a 24th Grand Slam.
Serena, a six-times champion in New York who is seeded 17th, will start her campaign against Polish world number 60 Magda Linette and could face Venus in the third round before a possible fourth-round showdown with Romanian top seed Halep.
Venus Williams beat top seed Angelique Kerber on Wednesday to advance to a Miami Open semi-final against Britain's Johanna Konta.
Former world number one Maria Sharapova avenged her US Open loss to Anastasija Sevastova with a 7-6(3), 5-7, 7-6(7) victory over the Latvian in the China Open first round on Saturday.
PHOTOS from day seven of the Wimbledon championships at the All England Lawn Tennis and Croquet Club in London on Monday
Grand Slam finalists Garbine Muguruza and Roberta Vinci stormed into the last four of the Wuhan Open in China on Thursday while Venus Williams ended the giant-killing run of Briton Johanna Konta.
The 36-year-old has been practising hard on the grass and few would bet against her becoming the first mother to win the title since Evonne Cawley 38 years ago.
Summary of sports events and persons who made news on Wednesday
Novak Djokovic maintained his unbeaten record against Frenchman Gael Monfils with a 6-3, 6-2 win in the semi-finals of the Rogers Cup in Toronto on Saturday, while Japan's Kei Nishikori also reached the final after beating Swiss second seed Stan Wawrinka.
Simona Halep and Caroline Wozniacki face a 'humongous' match that could define their careers when they face off in Saturday's Australian Open final, says former champion Mats Wilander.
Petra Kvitova was proud of her second-set fightback against Naomi Osaka in the Australian Open final, on Saturday, but was left ruing her inability to convert her chances in her loss to the Japanese.
Former men's champion Mats Wilander believes third seed Muguruza now looks like the most likely champion, having not dropped a set and thrashing Maria Sharapova on Wednesday.
Djokovic is clubbed with Federer, Juan Martin Del Potro, David Goffin and Alexander Zverev.
'Maria will look at it and see no one dominant. Serena Williams is the only player in the past who has been like a thorn in her side, but she feels mentally superior to most of the other and she feels she can win against them all'
The seventh-seeded Bulgarian advanced to his eighth ATP World Tour Masters 1000 quarter-final with a 6-3, 7-5 victory over Del Potro, who struggled with the intense heat in the closing stages of the one hour, 39 minute match.
Fifth seed Maria Sharapova averted an early exit on a sweltering day in Flushing Meadows. Updates from Wednesday's play.
Maria Sharapova was dogged by injury and controversy as she tried to get her career back on track.
Ana Ivanovic became the highest-profile casualty of Wimbledon's opening days as the seventh seed fell to 158th-ranked qualifier Bethanie Mattek-Sands in a second round clash.
List of Wimbledon women's singles champions:
The 'Big Four' of men's tennis have made it into the second week of Wimbledon unscathed and largely untroubled while the women's draw remains wide open, but "Manic Monday" could offer major clues as to the destination of this year's titles.
Images from the Australian Open in Melbourne on Thursday.
Victoria Azarenka was anything but amused when Kim Clijsters accused her of benefiting from "illegal coaching" from her players' box during her nail-biting victory over Britain's Heather Watson in the Wimbledon third round on Friday.
Defending champion Stan Wawrinka avoided a repeat on Wednesday of his first-round scare, though he was still made to work hard in a straight-sets win over Japan's Taro Daniel. The Swiss third seed won 7-6(7) 6-3 6-4 and is now on a six-match winning streak on clay, having warmed-up for Roland Garros by winning the title in Geneva last week. Progress was by no means straightforward against a skilful opponent ranked 93rd in the world and Wawrinka has yet to switch to his A game. But he says it's there when he needs it. "If you look at the first two matches, for sure I'm not playing my best tennis, but I know I have my best tennis in me," the 31-year-old Wawrinka, playing in his 45th consecutive grand slam tournament, told reporters.
Serena Williams recovered from a set down to beat Australian Ashleigh Barty 3-6, 6-3, 6-4 and book a place in the third round.
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