Stanley Weston painted the covers for THE RING, but I would guess that the black and white illustrations could have been by Jack Burnley. Burnley did those kind of illustrated sports features in the '30s for the newspapers and again, after he left comic books, from the late '40s through the mid-'70s.
Back in the '50s and '60s, my older brother collected sports publications in the bedroom we shared when we were growing up and I remember often seeing these images--which look to me like the work of Jack Burnley.