Nadal dropped 5 games against Delbonis and against Daniel Gimeno-Traver. Today, he dropped 4 games against Chardy. So just guess how many games will drop against Zeballos
Nadal in two seems logical (despite the fact that Zeballos is in form and winning lots of matches), but there can be troubles here because Zeballos is playing well and he is a leftie too, so if Nadal plays like he did in the second set of the match against Daniel Gimeno-Traver he can be put in pressure.
I go for Nadal in two, something like 6-4 and 6-3.