The four-time Grand Slam champion did not give a reason for her withdrawal, while Iga Swiatek said she wanted to rest after the Tokyo Olympics, where Osaka also competed.
Last year’s Roland Garros champion said: “I’m really sorry not to be able to come and play in Montreal this year. The first part of the season has been very intense for me and I need a few days to rest and prepare for the next few months. However, I am already looking forward to coming to Canada in 2022.”
Meanwhile, World number four Kenin has been side-lined with a foot injury since Wimbledon, and said: “I’m really disappointed to have to retire from the Omnium Banque Nationale.
“Even though I have made progress, my foot injury has not recovered enough to allow me to play at the highest level. I think I need an extra week of rest and rehabilitation.
“However, I would like to thank Tennis Canada for all the efforts the staff put in to keep the tournament going in a difficult environment and I wish all participating players the best of luck.”
