Pakistan, Aug. 2 -- 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.

American great Ledecky, 28, is the undisputed master in the event, having won the title at the last four Olympics and updating her own world record in May this year.

But McIntosh, 10 years Ledecky's junior, is in the mood to snatch her crown as she looks to join Michael Phelps as the only swimmer to win five individual titles at a single world championships. The 18-year-old Canadian has already bagged three golds from three events in Singapore and she clocked the third-fastest 800m freestyle time ever in June.

The other nine times on the top ...