Below, you'll see any text that was highlighted with comments from the reviewer.
The title. I'm a swimmer, too, and Katie's races are some of my favorites.
Maybe you could have said when this race was earlier on? Like maybe start with the date and where? Even though you said it I still for some reason thought it was the London 800 final.
Rowdy Gaines quotes. I would suggest finding footage of this race and putting some of them in.
As a swimmer who reads Splash, this is something that I could see myself reading in there.
I know from reading past sports articles that they're not usually in the first person. I think you did a good job with it, however. And since you were writing about Katie's Rio 800 final, maybe say how she was the favorite and how she was undefeated in individual swims at that time.