Norton's defense was fantastic for coping with straight punches. Foreman mostly went after him with wider punches and uppercuts while not neglecting the body. Shavers was similar throwing a lot of left hooks from the get go.
There's myriads of them but Hearns 1-2 was a potential fight ender and proved itself as such. Even Duran couldn't draw a bead on it and guys like Ceuvas never knew what was hitting them. Schuler and Roldan were ended. The list is long.