 Fifth seeds Kubot and Melo advanced to the quarter-finals of the Western & Southern Open for the second year in a row, beating Rogers Cup finalists Raven Klaasen and Michael Venus.The Polish-Brazilian duo avenged a loss they suffered against the same team one week ago in Toronto.In the quarterfinal Kubot and Melo lost to fourth seeds Jamie Murray and Bruno Soares, who triumphed in Acapulco and Washington, D.C. earlier this season.