Le Clos won the men’s 50m butterfly final in a championship record 21.95 seconds, just 0.08 outside Roland Schoeman’s five-year-old national record, as he edged Brazilian silver medallist Nicholas Santos by 0.13.
UPDATE: Chad le Clos bags fourth gold
The 22-year-old South African, who bagged 100m freestyle and 100m butterfly gold earlier in the week, remained the only SA swimmer to secure a medal, with only one day of competition remaining.
Meanwhile, in the last race of the evening, the SA quartet (Luke Pendock, Clayton Jimmie, Lehesta Kemp and Trudi Maree) finished seventh in the mixed 4x50m freestyle relay final in 1:33.19.
The United States won gold in a world record 1:28.57.
Cameron van der Burgh booked his place in Sunday night’s 50m breaststroke final, qualifying fourth fastest (26.11) in the penultimate round.
Fellow South African Giulio Zorzi was eliminated in the semifinals, taking 14th place in 26.68.
Leith Shankland was also knocked out in the semifinals, in the men’s 100m freestyle event. He was ranked 13th (47.46).