Conversation so far:
What event did Phelps do to win Michael Phelps's seventh gold metal?
the men's 100-meter butterfly.
who did he beat in that race?
US born Serbian swimmer Milorad Cavic.
was there any other swimmers mentioned that he beat?
CANNOTANSWER.

Question: What other interesting fact can you tell me about that race?
Self-contained rewrite: Besides beating Milorad Cavic, what other interesting facts can you tell me about the men's 100-meter butterfly race that Phelps won?