the former 800 world title-holder and 2012 olympic silver medalist won 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 50 meters .
semenya 's winning time was just over four seconds off the qualifying mark for the worlds in august , but she has run sparingly over the last three years because of injury problems .
caster semenya reclaimed the south african 800-meter title on saturday and said she 's injury-free and looking to qualify for the world championships .