BRENDON Dedekind demolished his sixth Africa record of the Telkom national short course championships in Johannesburg on Sunday morning, shattering the 50m butterfly mark. Dedekind finished his heat in 24,02 seconds, thrashing more than half-a-second off Andrew Bradley’s year-old 24,62 mark. The new mark is Dedekind’s sixth record in 11 swims at the four-day gala. The 23-year-old, also the 100m individual medley Africa record-holder, broke the 50m breaststroke, 50m freestyle marks, and the 100m freestyle record earlier.