World number 20 Aryna Sabalenka has crashed out of the Tournoi de Quebec in straight sets to Varvara Lepchenko 6-4 7-6 (7/5).
The tournament's top seed from Belarus fell at the first hurdle to the American in just over 90 minutes, serving up five double faults in the match.
There were no such dramas for Puerto Rican Monica Puig, who saw off Brazilian Beatriz Haddad Maia 6-2 6-3, while Canadian wild card Rebecca Marino beat seventh seed Tatjana Maria of Germany 6-2 6-2.
There were also wins for world 550 Olga Govortsova over Kristie Ahn 6-1 6-4 and Jessica Pegula 6-3 7-6 (8/6) over world 99 Kristyna Pliskova, while Francoise Abanda beat Tereza Martincova 4-6 6-2 6-2.
Hibino beats Bouchard
Home favourite Nao Hibino saw off Eugenie Bouchard to advance to the second round of the Hiroshima Open on Tuesday.
Hibino, ranked 138th in the world, entered the tournament as a wild card but broke the former Wimbledon finalist five times in a 6-4 6-4 victory.
Zhang eases past Frech
There were no problems for top seed Shuai Zhang of China, who eased past Poland's Magdalena Frech 7-5 6-3.
Second seed Su-Wei Hsieh of Chinese Taipei also advanced, although she had to work harder for her 4-6 6-1 6-3 win over Polona Hercog.
Other seeds through include China's Qiang Wang, Kazakhstan's Zarina Diyas and Magda Linette of Poland, who beat Priscilla Hon, Sara Sorribes Tormo and Johanna Larsson respectively.
Broady well beaten
Naomi Broady's involvement did not last long after she was soundly beaten by top seed Petra Martic in Quebec.
The British number four, was downed 6-1 6-1 by the Croatian, who is ranked 38 in the world.
Broady won the first game of the match, but things went badly after that as second-seed Martic reeled off 11 games in a row and won in only 56 minutes.