( CNN ) -- Home favorite Rafael Nadal was watched by a galaxy of football stars as he reached the third round of the Madrid Open with a straight sets win over Ukrainian qualifier Oleksandr Dolgopolov on Wednesday . Real Madrid stars past and present Cristiano Ronaldo , Raul and Zinedine Zidane were courtside at the Caja Magica to see the world number three battle to a 6-4 6-3 win . The second seed , who did not have things all his own way against Dolgopolov , will now face giant U.S. star John Isner , who struggled past Colombian qualifier Santiago Giraldo 1-6 7-6 6-3 . Nadal is playing on home clay in his final tournament before the French Open where he hopes to regain the title , won last year by Roger Federer and claim his fifth grand slam triumph at Roland Garros . Earlier , world number five Andy Roddick 's preparations for the second grand slam of the year suffered a setback as he was forced to pull out of his match against Spain 's Feliciano Lopez with a nasty stomach bug . `` I got here , and then on Sunday night through Monday evening I was up with a stomach virus . I was up for 24 hours vomiting , sweating , the whole deal , `` Roddick told the official ATP Tour Web site . Roddick has not played since winning the Miami Masters last month and said the illness had come at just the wrong time . `` It 's very bad timing . I would 've taken this virus any time in the last five weeks instead of now , but I guess that 's the way it goes sometimes , '' he said . `` Playing well in Paris is n't totally out of the question , it 's just going to be a little tough , '' he added . In the evening session , Britain 's Andy Murray , seeded third showed improved form on clay with a 6-3 6-3 win over Juan Ignacio Chela , his fourth straight win over the Argentine . `` I was pleased with the win , '' said Murray . `` I served well and was able to move him around the court . '' Meanwhile , Munich Open winner Mikhail Youzhny made an early exit to Latvian Ernest Gulbis 7-6 6-4 and 15th seed Stanislas Wawrinka set up a third-round showdown with world number one and Swiss compatriot Roger Federer after beating Leonardo Mayer , who was down 6-4 4-2 when he retired .
Rafael Nadal reached third round of the Madrid Masters with straight sets win . Nadal was watched by Real Madrid football stars as he beat Alexander Dolgopolov . World number five Andy Roddick suffers injury just ahead of French Open . Third seed Andy Murray beats Juan Ignacio Chela in straight sets .