Top seeds Dominic Thiem of Austria, Italians Fabio Fognini and Marco Cecchinato, and Diego Schwartzman of Argentina already were ousted. In the quarterfinals, Ruud will face Serbia's Laslo Dere, who eliminated Japan's Taro Daniel 6-4, 6-2.
2016 Rio Open champion Pablo Cuevas of Uruguay advanced after beating Argentina's Juan Ignacio Londero 6-1, 6-4. Cuevas will face Spain's Albert Ramos-Vinolas in the quarterfinals. Ramos-Vinolas defeated Argentina's Federico Delbonis 3-6, 7-5, 6-3.
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