The Quickest Kid in Clarksville by Pat Zietlow Miller illustrated by Frank Morrisono

Alta is the "fastest kid in Clarksville" but then Charmaine moves into town and gives Alta some competition.  When Wilma Rudolph returns to Clarksville, her home town, for a parade to honor her, the girls put aside their differences.
Told in first person narrative.
The author shares a few facts about Wilma Rudolph at the end.
-Borrowed from the library.