I remember reading accounts of Ernest Roeber around 1900 where they're clearly working angles.
Here's a note from an 1880 newspaper. Wrestling is mentioned along with other sports. It would be awfully naive to think that every sport was crooked/fixed EXCEPT wrestling. The difference in that era was that wrestlers could compete if they HAD to.
Morning appeal. [volume] (Carson City, Nev.) 1877-1906, May 22, 1880, Image 2 « Chronicling America « Library of Congress (loc.gov)