Master vs Deathstroke
I think we have found a perfect match for Slade. Strength Level: The Master is a perfect physical specimen, although he is not superhuman. He can lift (press) 800 pounds with great effort.
Known Superhuman Powers: None, however, the Master is virtually immortal, although he is not invulnerable. The white streaks in his beard are the only outward sign of his aging. As noted, he has been alive, either in his original body, as a disembodied brain, or in his current body, for forty thousand years.
Other Abilities: The Master has a genius level intellect, and, thanks to his former link to the Plodex ship computers, holds most of the knowledge of the Plodex (as of forty thousand years ago when the starship was launched) and of Earth humans in his mind.
The Master also retains his knowledge of hand-to-hand combat from his days as a tribesman forty thousand years ago. His knowledge of how to manipulate pressure points on humanoid bodies is so great that he has been able to use it to render the superhuman strong Sub-Mariner unconscious, even though he himself has no superhuman strength.