Next up for the Pole is Belgium's Kirsten Flipkens, who saw off Croatia's Ajla Tomljanovic 6-7, 6-4, 6-3 to continue her best start to a season -- as she reached her fourth quarterfinal of the year.
Indeed, the Pole may earn first-choice status if he continues the form that saw him make two great saves from a Marcus Berg shot and a David Rozehnal header.