I have seen enough no he ısnt at his best by any means. He isnt playing as well as last year not in this RG nor all clay court season. Hıs level play of isnt as bad as 2015 thats for sure but also ıf he go on to lose ıt wont be huge SHOCK like it was in 2009 RG. If someone puts heat on him like Delpo or Thıem he is vulnerable. He already lost to Thiem anyway this clay court season and was lucky against Zverev. Even he goes on to win somehow this isnt the Nadal of 2008,2010,2012 and 2017 where at times he looked invincible. For me at times he showed his age on court this year.Not a huge slump like 2015 and 2016 at the moment but he doesnt look all that amazing at all.3 rd defeat is on the cards and ıt wont be huge shock by any means.