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World No. 1 Nadal rescued his country as he joined forces with Marcel Granollers to win the deciding doubles rubber of their quarterfinal against Argentina and set up a clash with Britain who beat Germany 2-0.
World number one Osaka overpowers 15-year-old Gauff while the Spaniad packs off Chung Hyeon to meet Marin Cilic for a place in the quarter-finals.
Former women's world No. 1 Halep suffered a shocki defeat at the hands of American qualifier Taylor Townsend.
Austria's Dominic Thiem, Greek Stefanos Tsitsipas, Russian Karen Khachanov and Spaniard Roberto Bautista Agut were all sent packing before Rafael Nadal restored some semblance of order to his half of the draw.
Rublev needed just over an hour to beat Federer 6-3, 6-4 in the third round of the Cincinnati Masters, the Swiss 20-time Grand Slam champion suffering his quickest defeat for 16 years.
Usha, known as 'Payyoli Express', blazed the tracks at the Asian stage in the 1980s.
World No. 3 and top seed Alexander, 21, broke Mischa, 30, three times en route to a victory that sets up a quarterfinal with seventh seed Kei Nishikori.