In the men's event Tomas Berdych can clinch a first claycourt title for five years on Sunday after reaching the final with a 6-2 6-2 victory over Romania's Victor Hanescu.
The Czech world number six was untroubled by Hanescu, powering into a final against Argentina's Carlos Berlocq.
Berdych, regarded as a hardcourt specialist, last won a tournament on clay in Munich in 2009.
Berlocq beat Daniel Gimeno-Traver of Spain 7-6(6) 6-2.
Suarez Navarro said she was delighted to continue an impressive season with some big tournaments ahead.
"I'm very happy I could finally win my first WTA title," she told the WTA website.
"I was a little bit nervous today. It was a difficult match too - it was windy today and we were both making mistakes.
"Now there's Madrid, Rome and Roland Garros, which to me is the best tournament of the year, but it's still far - most important right now is the next tournament in Madrid."
(Writing by Martyn Herman, editing by Alan Baldwin)
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