求翻译：Historically, grass hasn’t been Djokovic’s favorite surface and this year he did not choose to play warm up tournaments on this surface. He skipped Queens and I suspect he is conserving some of his energy after the incredible run he has had over the past 5 or 6 months. The prospect of being the new number 1, depending upon what happens with Nadal, and his strong serve and return will make Djokovic very difficult to beat.是什么意思？

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