Britain's Cameron Norrie saved a match point as he produced a superb fightback to beat world number seven Alex de Minaur at the Canadian Open.
Norrie was a set and 5-2 down against the Australian third seed before coming through 5-7 7-6 (7-5) 6-1 to reach the fourth round.
De Minaur, leading by a double-break, had a match point on his own serve in the second set but double-faulted.
He twice served for the match but, at 5-4 up, double-faulted again to put the set back on level terms.
World number 37 Norrie edged the tie-break and then ran away with the deciding set to complete victory in two hours and 52 minutes.
"It was a great match to win and to test my level, and I can take so much confidence from this one," the 30-year-old said.
"From the beginning, [de Minaur] came out firing and I had to match it."
Norrie - who reached the Los Cabos semi-finals last week - will face France's Arthur Fils for a place in the quarter-finals.
De Minaur's exit means that fifth seed Ben Shelton is the only top-10 men's player remaining in Montreal.
World number one Jannik Sinner and third-ranked Novak Djokovic withdrew before the tournament began, while top seed Alexander Zverev lost his first match.
Sixth-ranked Daniil Medvedev, seventh seed Taylor Fritz and world number nine Flavio Cobolli also all lost in the second round.
Sabalenka has lost just once in 26 hard-court matches this season - in January's Australian Open final against Elena Rybakina.
The Belarusian beat China's Zhang Shuai 6-3 6-4 and will face 16th seed Ekaterina Alexandrova of Russia next.
Seventh seed Iga Swiatek beat Viktorija Golubic 6-2 6-1 in just 66 minutes to set up a meeting with Ukraine's Marta Kostyuk.
Kostyuk, who beat Swiatek in the French Open fourth round in June, dismantled Madison Keys 6-3 6-1.
Third seed Jessica Pegula claimed her 40th match win of the season as she beat Kamilla Rakhimova 6-4 6-0 either side of a rain delay.
Eight of the top-10 players are still in the women's event. Wimbledon champion and sixth seed Linda Noskova lost in the second round, while seventh-ranked Karolina Muchova missed the event with injury.
