USA's Katie Ledecky: 'It's been great to win three world golds this week'

The USA's Katie Ledecky has expressed her joy after claiming three gold medals so far at the World Championships in Kazan, Russia.

The 18-year-old won titles in the 400m freestyle and 1500m freestyle earlier this week, and she added to her success with victory in the 200m final today.

"It's been a great week and I have few more races left, but I'm really happy," Ledecky told Eurosport. "I put the training in to have the confidence in all these races and focus on one race at a time."

Ledecky also broke a world record in the 1500m freestyle on Tuesday.