Van der Burgh in record-breaking form in Kazan heats

KAZAN, Russia (Reuters) - South Africa's Cameron van der Burgh became the first male swimmer to set a world record at this year's world championships on Tuesday, lowering his own 50 metre breaststroke mark to secure a semi-final berth in style. The 26-year-old defending champion touched the wall in 26.62 seconds to join Sarah Sjostrum, Katie Ledecky and Katinka Hosszu's world record efforts during the first two days of competition in Russia.