“She does not have a mental block against Serena,” he said. “Serena simply plays tennis much better than she does. ... Sharapova is a great champion. She has great qualities. She fights incredibly and has tremendous mental strength. But at some stage, her level of play hits a ceiling.
“That said, Serena is not immune to a bad match, right? All streaks have to end, but even if she has a bad match one day and loses, we cannot say there is not an enormous gap in their level of play.”