The three-times champion, who gave birth last September and lost in the Wimbledon final 10 days ago, has not competed in Montreal since her run to the semi-finals in 2014 and last played the Rogers Cup in Toronto the following year.
Three-time US Open champion Djokovic, who comes into the tournament having won his fifth Wimbledon title, is followed in the seedings by 2017 winner Rafael Nadal.
Venus Williams is a two-time mixed doubles winner at Grand Slams, triumphing at the Australian Open and Roland Garros in 1998.
American tennis ace Serena Williams has maintained her No 1 spot, while German Angelique Kerber has slipped to the third in the latest women's tennis world rankings issued by the WTA.
Tennis champion Serena Williams glammed it up in Hollywood.
Serena Williams has extended her lead in the WTA rankings after her fourth consecutive Grand Slam title at Wimbledon, with the World No 1 now having more than twice as many points as her closest competitor Maria Sharapova.
Key facts and records of American Serena Williams and Canada's Bianca Andreescu
Eager to witness what many felt would be Serena Williams's final competitive match, thousands of fans poured into the Arthur Ashe stadium.
Halep, who won the French Open in 2018 and Wimbledon the following year, struggled for results last year due to injuries and reached only one WTA final, at the Transylvania Open, losing in her home tournament.
Steamrolls Dutch Rus to proceed to Round 2
Serena Williams was once again on the stage but this time it was her own fashion show during New York Fashion Week.
Tennis legend Serena Williams spent her first Christmas with her 3-month-old daughter, Alexis Olympia.
It was Halep's second Grand Slam title following her triumph at Roland Garros in Paris last year.
Eight-time Wimbledon champion Roger Federer, who turns 40 this year, takes on Frenchman Adrian Mannarino in round one.
There is no secret to beating Serena Williams, says her US Open semi-final opponent Victoria Azarenka, the only chance to win is to fight hard, execute well and remember the 23-times Grand Slam champion is never out of it, no matter the score.
The 36-year-old, talked about what she has been going through since giving birth to her daughter, Alexis Olympia, who turns one this September.
Serena displayed great mobility to win successive points after long rallies -- one of 21 shots, one of 13 -- and secure what proved to be a decisive break of serve.
Naomi Osaka ended Victoria Azarenka's dream run to claim her second US Open title in three years with a 1-6, 6-3, 6-3 comeback win on Saturday which cemented her status as the sport's leading light both on and off the court.
Serena Williams likened the frustration she felt in Tuesday's shock defeat by Maria Sakkari at the Western and Southern Open to that of being stuck in a bad relationship.
The video shows Williams covering her breasts with her hands while singing the global hit song of an Australian Band, The Divinyls.
'The Laver Cup next week in London will be my final ATP event. I will play more tennis in the future, of course, but just not in Grand Slams or on the tour.'
Serena Williams returns to the Arthur Ashe Stadium on Sunday
Three-times winner Serena Williams moved into the Toronto Open second round after beating Spain's Nuria Parrizas Diaz on Monday
Novak Djokovic beat Daniil Medvedev in the US Open final to win a 24th Grand Slam singles title and equal Margaret Court's record haul.
Eighth seed Jabeur faced a tougher time against Russian Gracheva as she survived a double break in the decider to set up a meeting with Olympic gold medallist Belinda Bencic, who got the better of Karolina Muchova 6-3, 4-6, 7-5.
In the men's singles draw five-time champion Novak Djokovic headlines the top half of the draw and shares a quarter with Russian No.5 seed and recent Halle finalist Andrey Rublev.
Israeli-American actress Natalie Portman and more than a dozen former US women's national team players have formed an ownership group to set up a professional women's soccer team in Los Angeles from 2022. The new team, which has yet to be named, was announced by the National Women's Soccer League (NWSL) on Tuesday.
Newly-engaged Serena Williams touched down in Auckland on Friday and quickly made her way to the court to hit some balls ahead of the start of her 2017 season.
Serena Williams beat Germany's Angelique Kerber 7-5, 6-3 to claim a seventh Wimbledon singles title and equal Steffi Graf's professional era record of 22 grand slam singles crowns on Saturday.
As the first day's play got under way, she posted a video clip on Instagram of her pounding backhands on a clay court despite being absent from the tour since winning the Australian Open in January as she is expecting her first child.
Frenchman Adrian Mannarino also quit at two sets apiece against eight-times champion Roger Federer after sliding over on Centre Court and injuring his knee.
International Premier Tennis League founder Mahesh Bhupathi, one of India's most successful doubles player, confirmed the absence of the two star players.
How the winners celebrated on Day 11 of the French Open.
Serena Williams and Caroline Wozniacki have been enjoying an end of season break in a luxurious resort in the Bahamas. Both have been showing their fans some flesh, via their Instagram accounts.
Serena Williams has been fined $17,000 (13,156) for the code violations she received during the US Open final, the United States Tennis Association (USTA) said on Sunday.
Overpowers Svitolina to reach second straight US Open final
Serena Williams was the runner-up in Flushing Meadows each of the past two years
IMAGES from Day 11 of the French Open at Roland Garros in Paris on Wednesday.
Serena Williams faces her first seeded opponent at the French Open on Thursday and will hope to use her booming serve to beat Australian Ashleigh Barty in the second round.
Former world number one Serena Williams returns to Grand Slam action for the first time in over 15 months, when she goes up against Czech Kristyna Pliskova in the French Open first round.