Katie Ledecky passes Michael Phelps’ mark for most individual golds at worlds

• Ledecky wins 800 freestyle world title for record sixth time
• American breaks tie with Phelps for most golds at worlds
• Australia's McKeown takes gold in women's 200 backstroke

Here's why Katie Ledecky is one of the greatest freestyle swimmers in the history of the sport. She's never quite satisfied.

The 26-year-old American won the 800 freestyle on Saturday at the world aquatics championships to become the first swimmer to win six golds in the same event at the worlds. It was also her 16th individual world title, breaking a tie with legendary Michael Phelps for the most golds at worlds.