The 1988 WTA Brasil Open (also called the Rainha Cup) was a women's tennis tournament played on outdoor hard courts in Guarujá in Brazil and was part of the Category 1 tier of the 1988 WTA Tour.

Third-seeded Mercedes Paz won the singles title.

[1] Mercedes Paz defeated Rene Simpson 7–5, 6–2 Bettina Fulco / Mercedes Paz defeated Carin Bakkum / Simone Schilder 6–3, 6–4

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