Ledecky, trailing McIntosh at the 700-meter mark, surged ahead on the final lap, fending off a hard-charging Pallister as McIntosh faded in the closing meters. With the win, Ledecky remained undefeated in the 800-meter freestyle finals event on the world stage dating back to 2012.

Katie Ledecky remains a dominant force in competitive swimming. The Olympic swimmer, 28, won her seventh consecutive world title at the world championships in Singapore on Saturday, Aug. 2, in the 800-meter freestyle, besting other top swimmers including Australia’s Lani Pallister and Canada’s Summer McIntosh, 18.