Ukraine's Kateryna Kozlova stunned five-seeded Karolina Pliskova 7-5, 2-6, 6-4 in one hour and 51 minutes in the second round of the WTA Madrid Open to set up a round of 16 clash with Belinda Bencic. The 25-year-old Ukrainian, who is world number 85, is making her debut in the Spanish tournament.