Yep, people need to give Zeballos some credit. I realize Nadal is rusty, but Zeballos played damned good. His serve was absolutely awesome. His backhand didn't break down. He was consistently aggressive and going for all of his shots.
To me, the Nadal's biggest problem was his own serve. He is not hitting the slice well. He isn't hitting the body serve well. Not nearly enough floating returns for putaway winners. I expect this will get better with each match, though.
Head Youtek Graphene Speed Pro
VS Gut Mains 16g @ 52lbs / RPM Blast Crosses 17g @ 50lbs