Ajla Tomljanovic has retired midway through her first round match at the Omnium Banque Nationale in Montreal with a right hip injury.
Tomljanovic, who is the only Australian competing in the main draw in Montreal came up against Frenchwoman Fiona Ferro in the first round on Monday.
The Aussie got off to the perfect start, dominating early to take the first set 6-2. However, Tomljanovic unfortunately sustained a right hip injury which would see her retire after dropping the second set 2-6.
Two seeds exited the tournament on day one in Montreal.
On Centre Court, Canadian wildcard Rebecca Marino claimed a major upset win over 16th seed and 2016 runner-up Madison Keys, 6-3, 6-3, in their first round encounter.
Over on Court Rogers, 14th seed Karolina Muchova also exited the tournament, toppled by Frenchwoman Oceane Dodin 3-6, 6-1, 2-6.
Local hope Leylah Fernandez also exited on day one, going down to British qualifier Harriet Dart 5-7, 6-7(4).
Spaniard Paula Badosa continued her impressive season, advancing to the second round unscathed with a 6-2, 6-3 victory over Viktorija Golubic.
13th seed Ons Jabeur was also on the winners list, defeating Clara Burel 6-1, 6-3. 11th seed Maria Sakkari advanced to the second round after her opponent Marie Bouzkova retired with dizziness midway through the second set of their match.
Cori Gauff will kick off proceedings on Centre Court on Tuesday when she faces Latvian Anastasija Sevastova. Seeds Garbine Muguruza, Petra Kvitova, Bianca Andreescu and Victoria Azarenka will also be in action on Centre Court.
Australian Ellen Perez, teaming up with Czech Kveta Peschke are the seventh seeds and will kick off their tournament on Tuesday on Court 5.
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