Ounis Jabier of Tunisia defeated second seed defending champion Bianca Andresco in the WTA Hardcourt Tournament 6-7 (5/7), 6-4, 6-1 in Montreal on Thursday.
The third-round trouble was stopped twice by rain as Birmingham champion Jubair – the first Arab woman to win a WTA title – completed the second defeat of the day for Canada.
Earlier, top seed Ariana Sabalinka defeated 220th-ranked local Rebecca Marino 6-1, 6-3 in one hour.
Xavier won his 36th match of the season, the second best on the tour behind Sabalinka, with 37.
13th seed Xavier won the third set and advanced to his second match point. He defeated former US Open champion Andresco six times.
“Great match,” Jabbar said. “It was difficult. I know it’s hard to play Bianca here in Montreal, Canada.”
Jabbar said he felt tired in his opponent, who got a late medical timeout in the second set after coming down strangely on his left foot.
“I think she’s a little tired. I can see her from the second set. It’s normal.
“I was more focused on what I should do. I really focused on better returns, better service. It helped me a lot in the third set.”
Jubair’s next match is against American Jessica Pegola, who needed six match points to beat Red Hot compatriot Daniel Collins 6-4, 3-6, 7-5.
Collins arrived in Montreal after winning back-to-back titles in Palermo and San Jose, but she was unable to stop Pagola in a match that lasted two hours and 28 minutes and ended at 1:30 p.m.
Sabalinka will play double grand slam champion Victoria Azarenka in the semi-finals.
Azarenka will play in the Canadian Quarter for the first time in seven years.
“It was a great fight with a lot of rallies,” Azarenka said. “Maria played very well.
“I was able to take advantage of the crucial moments of the third set. After the break (after Wimbledon) the matches where I have to find a solution to win are very important.”
Sabalinka has won two of three matches with her three-year-old compatriot Azarenka, who counts the pair of Australian Open titles in her trophy collection.
Sabalinka halted Marino’s development as the Canadian continued to revive his career, which was hampered for five years by mental health concerns.
Sabalinka broke Marino four times and saved all five breakpoints he faced.
Sabalinka, who has not lost to a player outside the top 200 since June 2019, will play her eighth quarterfinal of the season.
– Pleskova advance
Fourth seed Carolina Pliskova mimicked the best of her Canadian career with a 6-1, 7-6 (10/8) victory over Amanda Anisimova.
Pliskova’s next match will be against Sarah Sorbes of Spain, who defeated Czech Katrina Seniakova 6-7 (4/7), 6-0, 6-3.
Seventh seed Petra Kvitova was defeated by Camilla Giorgi of Italy 6-4, 6-4.
Britain’s Johanna Conta, who upset third seed Elena Svetolina in the third round, withdrew from a knee injury, giving Coco Goff a walkover – which will see Georgie fight for a place in the semi-finals.
The 17-year-old American has played only one full match so far this week when Russia’s Anastasia Potapova dropped her third rounder with an ankle injury.