Berlin 's David Lekuta Rudisha sets a new world record in the men 's 800 meters . Caster Semenya clocks a time of one minute 41.09 seconds in Kenya on 1:41.51 . His time shaved two hundredths of a second off the previous mark set by Wilson Kipketer . `` It feels good to be back in Berlin . Women 's world 800m champion Caster Semenya won her second comeback race .
Berlin 's David Lekuta Rudisha sets a new world record in the men 's 800 meters . Caster Semenya clocks a time of one minute 41.09 seconds in Kenya on 1:41.51 . His time shaved two hundredths of a second off the previous mark set by Wilson Kipketer . Women 's world 800m champion Caster Semenya won her second comeback race .