Sinner and Kalinskaya poised for De Minaur-Boulter double
Getty Images Stefanos Tsitsipas and Paula Badosa still have some work to do when it comes to on-court success, but the other two “power couples” on the ATP and WTA Tours are flying high these days. Twice already this season Alex de Minaur and Katie Boulter have won titles in the same week. It first…