There are no world records for will or mental toughness, but rest assured Katie Ledecky would hold them if there were.
All you needed to be certain of that was to see what Ledecky did Tuesday with almost no rest assured.
That is why Ledecky's most remarkable achievement on day three of the World Swimming Championships in Kazan, Russia was not setting her second world record in two days while winning a second straight world title in the 1,500-meter freestyle.
It was what she pulled off 32 minutes later in the semifinals of the 200 free.
Seventh of eight after 150 meters left, seemingly dead (tired) in the water, the 18-year-old from Bethesda,...