Description:
dark horse
/ˈdärk ˈˌhôrs/
noun
1. a candidate or competitor about whom little is known but who unexpectedly wins or succeeds.
"a dark-horse candidate"
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Beau Maibaum THE ANK WILLIAMS STORY
Wayne Kyle Spitzer THE MELTING POT OF US
Khaled T. Aly THE SLOW APOCALYPSE OF THE CLOCKWORK SAINTS
Lucien R. Starchild THE THING ABOUT ASHRIDGE
Bri Eberhart THE SIMOOM
Rex A. Paar WE INTERRUPT YOUR REGULARLY SCHEDULED PROGRAM
James Rumpel GRASSHOPPERS
Theodora Sterling