Janko Tipsarevic, who was scheduled to face Rafael Nadal in Barcelona, heaps praise on the six-time Roland Garros champion. "Rafa is playing better than ever again on clay," he told reporters. "I know the records of the past, but Rafa is on track to be the best player on clay for all time. It's amazing how wins his matches, without dropping a set. He’s the worst opponent you can imagine on this surface."