Kateryna Bondarenko of Ukraine has upset third-ranked Venus Williams 1-6 7-5 6-4 in the second round of a WTA tennis tournament in Toronto.
Williams roared to a quick victory in the opening set but by the finish had fallen to 0-3 all-time in the Canadian event, the final major tuneup for many players ahead of the US Open.
Bondarenko is ranked 64th and will face either Hungary's Agnes Szavay or Poland's Agnieska Radwanska in the third round.
Serbia's Ana Ivanovic advanced by rallying to defeat Slovakia's Magdalena Rybarikova in three sets and will play the Czech Lucie Safarova.
And China's Zheng Jie could face Kim Cljisters after ousting Russia's Elena Vesnina in straight sets.