Djokovic has never before faced world No 83 Delbonis but he will be keen to avoid a second embarrassment in as many tournaments.
The Serbian crashed out of the Indian Wells Masters in the third round with a shock defeat to Philipp Kohlschreiber.
He beat Bernard Tomic on Friday to reach the same stage of the Miami Open.
But world No 1 Djokovic will not want to be downed by a lowly-ranked opponent once again.
“Six-time champion here is Novak,” Smith told Amazon Prime.
“I think he is going to be tough to beat and fired up off an early exit last week.
“It is going to be pretty difficult to hit winners against him given how the court surface is.
“He beat Bernard Tomic a few nights ago.”
Djokovic admitted to being nervous coming into the Miami Open because of his recent defeat.
But he will look to put those worries to be completely by reaching the fourth round.
“Of course, everyone has nerves, I guess, coming into a center court, regardless of how much experience you have, how high ranked you are,” he said after beating Tomic.
“I mean, you care about it. If you’re feeling excited and also a little bit nervy about your performance, it means you care about it.
“It’s a normal feeling that I commonly have coming into tournaments like this. It was nothing unusual really, except the fact that I was playing obviously on a big stadium for the first time.
“I’ve never had this kind of experience, so I thought it was really unique.
“It feels like indoor a little bit. It’s quite different conditions than from playing on the outside courts where it’s quite windy during the day. centre court has literally no sun after 1pm. It does feel like an indoor a little bit.”
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