The Old Man I knew back in TN matched directly into both Burton (a few times) as well as Mayfield (once).
He beat Burton but lost to Mayfield.
When he faced Mayfield, the Old Man traveled to TX, and after the roadtrip to get there he said Mayfield continued to give him the runaround ...
making the crew first drive here, then drive there, etc. ... before the match actually took place.
When they arrived, the Old Man said Mayfield also had the scales rigged, and so (to make a long story short) Mayfield used a lot more than "conditioning" to win dogfights ...
The man who mentored the Old Man in the 60s (a local dogman named Paul Sweeney) faced and beat Earl Tudor 3-4x.
Jack