It’s Katie Ledecky of the United States against Summer McIntosh of Canada in the final of the 800-meter freestyle, probably the most anticipated race at the swimming world championships in Singapore.

Summer McIntosh and Katie Ledecky set up a showdown for the ages at swimming's world championships in Singapore when both stars cruised into the 800m freestyle final on Friday.

Katie Ledecky showed it will take a monumental effort to pry the 800 metres freestyle title from her grip after the American great came home more than five seconds quicker that Summer McIntosh in the world championships heats on Friday.