It's going to be tough for Nadal to take out former world #4 and 2016 Olympic Bronze medalist Nishikori, I'm not looking past that match right now.
I just think Zverev has a punchers chance, same with Thiem to take out the Djoker.
Federer and Wawrinka will also hopefully be a good one, depends how much the Stanimal has recovered.
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