A swimmer with no Olympic experience had the fastest 100m free ever in a U.S. pool.
Kotsenburg was "the favorite moment of the Games," President Obama said.
Read the full 44-page review.
She was sixth fastest in the morning prelims.
“Being totally honest with you, it’s something that terrifies me."
Earlier this month, Ledecky wasn't named the best athlete in her own conference.
The world team is determined this week.