The former 800m world title-holder and 2012 Olympic silver medalist won on Saturday in 2 minutes, 5.05 seconds in Stellenbosch, near Cape Town, making her move on the last corner and pulling away from the field through the final 50m.
Semenya's winning time was just over four seconds off the qualifying mark for the worlds in Beijing in August, but she has run sparingly over the last three years because of injury problems.
She said the world championships in August were "the aim - the most important thing is to stay healthy."
Semenya is being guided by new coach Jean Verster after splitting with former Olympic champion Maria Mutola.
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