She was fastest again in Friday's first session but was beaten by former Red Bull junior Visser in the damp second at a circuit that hosted Formula One between 1973 and 1984.
"Having not been here before, I had to learn the circuit and try to get into it quite quickly. So I think there was a bit more potential there, but it’s going to be close tomorrow," said Chadwick.
The six-race series has attracted plenty of interest, with television deals putting it out to a free-to-air audience in countries like Britain, as a concept aimed at helping women up the motorsport ladder.
The series winner will collect $500,000, with prize money down to 18th place.
(Reporting by Alan Baldwin, editing by Pritha Sarkar)
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