Novak Djokovic loses 2 -6 ( 2 ) , 6 -3 to Janko Tipsarevic in Madrid . Serena Williams says he will not play in Madrid again while the clay is blue . Nadal said he would also boycott the event after his loss this week . Federer will replace Nadal at No . 2 in the rankings if he wins the tournament , thereby increasing his chances of being seeded second for the French Open . Roger Federer , Janko Tipsarevic and Janko Tipsarevic all through to semifinals .
Novak Djokovic loses 2 -6 ( 2 ) , 6 -3 to Janko Tipsarevic in Madrid . Serena Williams says he will not play in Madrid again while the clay is blue . Nadal said he would also boycott the event after his loss this week . Roger Federer , Janko Tipsarevic and Janko Tipsarevic all through to semifinals .