South African star Caster Semenya set a new world best for 600m at the 76th edition of the ISTAF meet in Berlin, Germany.

The Olympic and newly crowned world 800m champion posted 1:21.77 to break the previous best of 1:22.63 set 20 years ago by Ana Fidelia Quirot of Cuba.

Semenya won her first world title at the Olympic Stadium in 2009 and today’s (August 27) world best performance will add to the special memories she has of Berlin.

American Ajee Wilson, the world 800m bronze medallist also dipped under the previous world best, clocking 1:22.39 behind Semenya.