If Sabalenka fails to reach the round of 16 in Toronto, Kazakhstan's Rybakina can rise to number one if she lifts the trophy. Former world number one Swiatek, a six-time Grand Slam champion, will be aiming to regroup after slumping to a third-round defeat at Wimbledon. AdvertisementAdvertisement AdvertisementRybakina anchors a bottom half of the draw that also includes fourth-seeded Coco Gauff, four-time Grand Slam champion Osaka and newly crowned Wimbledon champion Linda Noskova. AdvertisementAdvertisement Advertisement- Tricky schedule -The ATP Masters 1000 in Montreal this week has also been hit by high-profile defections, including that of Wimbledon champion Jannik Sinner. Seven-time Grand Slam champion Venus Williams bowed out in the first round, falling 6-4, 6-1 to Uzbekistan's Kamilla Rakhimova.