WTA Chicago: Bencic and Svitolina win, Andreescu and Petkovic lose

Belinda Bencic and Elina Svitolina made their opening games at the WTA 500 tournament in Chicago successful. Anastasia Pavlyuchenkova and Bianca Andreescu , on the other hand, just like the German Andrea Petkovic, have already had to give up the sails.