Iga Swiatek left Spain reeling on Monday as Poland booked a 2-1 win to move into the quarter-finals of the United Cup whilst holders United States were beaten by hosts Australia. The 2-1 victory for Australia propelled them into the last eight as well. World number one Swiatek showed no mercy to Sara Sorribes Tormo in a 6-2, 6-1 singles victory before teaming up with Hubert Hurkacz to clinch the tie with a 6-0, 6-0 mixed doubles thrashing in just 53 minutes. Hurkacz was ambushed in the day's opening singles, losing 3-6, 6-3, 6-4 to Alejandro Davidovich Fokina.