“Ride ’Em, Cowboy!” by L. Ron Hubbard
Publication date: July 1938
Original publication: Western Story Magazine
Story description: When a champion broncobuster and the fiercely independent girl he loves compete for the same prize at a rodeo, besting wild horses is just part of the unfolding drama.
Currently available as part of the Stories from the Golden Age series, in the title Death Waits at Sundown.